- Open Access
Pyrethroid residues on tropical soil of an Indonesian tea plantation: analytical method development, monitoring, and risk assessment
Sustainable Environment Research volume 30, Article number: 15 (2020)
Despite their massive application in tea plantation, synthetic pyrethroids had never been detected in tropical soils of tea plantation thus their risk has never been assessed. This research reported the detection of synthetic pyrethroids in tea plantation and assessed their aquatic ecotoxicological risk. A simplified analytical method based on the application of a miniaturized sample, solvent, and efficient ultra-sonic assisted extraction was developed for the determination of pyrethroids in the soil. The method was validated with the result of all parameters (recovery, % relative standard deviations, linearity, limit of detection (LoD), and matrix effect) met the acceptance limits suggested by European Commission guideline, thus deemed acceptable for the assessment of pyrethroids in tropical soil of tea plantation during the wet and dry season. Of the five synthetic pyrethroids, only permethrin was detected in both wet and dry seasons (< LoD – 0.36 μg g− 1), whereas deltamethrin was detected only in wet season (< LoD – 0.12 μg g− 1). Scanning electron microscopy with energy-dispersive X-ray spectrometry and X-ray diffraction revealed that the soil constituted by various soil minerals made permethrin more likely to persist than deltamethrin. Aquatic ecotoxicological risk assessment was performed on the basis of comparison between the maximum equilibrium concentration expected in water (ECEWmax) value and lethal concentration (LC50) of pyrethroids exposure for aquatic species (algae, crustacean, and fish) inhabiting the Upper Citarum River. The ECEWmax value for the present condition was lower than LC50 for all examined species, indicating that the high-level contamination in the future should have posed a high risk for all aquatic species based on their LC50.
Over the last four decades, pyrethroids have been commonly used worldwide as pesticides in both domestic and agricultural environments . Pyrethroids are preferred over highly toxic organophosphorus and organochlorine pesticides because of their lower toxicity to human compared to the last two but still lethal to targeted pests even at low concentrations . At present, however, pyrethroids are emerging pollutants due to their ecotoxicological effects on aquatic systems even at extremely low concentrations .
Long-term and repeated application of synthetic pyrethroids during agricultural cultivation may contaminate the environment through leaching and runoff. Numerous studies have reported the presence of synthetic pyrethroids such as bifenthrin, cyfluthrin, permethrin, cypermethrin, deltamethrin, and lambda-cyhalothrin in several rivers in urban and agricultural regions [4,5,6].
Soil is a well-known terrestrial reservoir of pesticides and other persistent contaminants. Due to their higher affinity for organic carbon and clay in the soil, pyrethroids persist longer in the soil and sediments (up to 1 yr) despite their shorter half-life than other classes of pesticides . Moreover, under anaerobic environments, the mobility and persistence of pyrethroids are lower (with an average half-life of up to 619 d) than those of other types of pesticides .
Furthermore, pyrethroids pose risks to humans through the food chain and direct contact because of their presence in aquatic organisms and surface water. Previous studies have demonstrated the toxicity of synthetic pyrethroids in aquatic organism, with a very low lethal concentration (LC50) of < 1 ppb [4, 9, 10]. Moreover, the International Agency for Research on Cancer and World Health Organization (WHO) have classified pyrethroids as non-carcinogens and moderately hazardous pesticides . WHO and the European Union (EU) have recommended that the maximum concentrations of permethrin and individual pesticides in drinking water should be 20 and 0.01 μg L− 1 respectively .
Although pyrethroids are hazardous to the environment, it is difficult, particularly in tea plantation, to avoid their use as insecticides. Even China and India, which are recognized for producing high-quality tea, rely on synthetic pyrethroids to combat pests and diseases. In Indonesia, the presence of pests and diseases in tea plantation is closely related to climate change and uncontrolled insecticide application, which render tea plantation vulnerable to pests and diseases. Synthetic pyrethroids including bifenthrin, deltamethrin, and permethrin are commonly used insecticides for sustainable tea production.
Furthermore, the risk assessment of synthetic pyrethroids in the tropical soil of a tea plantation has never been performed due to the absence of pyrethroids detected in the soils. Numerous studies to determine and monitor pyrethroids in various plantation and farmland in tropical countries, including Malaysia , China , India , Pakistan , the Philippines , and Ghana  have been conducted. However, there is limited information regarding the presence of pyrethroids in the tropical soil of tea plantation such as in West Bengal, India . In addition, since the great divergence of spatio-temporal can have important implication for the distribution and persistence of pyrethroids, due to the differences in climate and soil types, therefore it is important to obtain the specific data from the local conditions.
Typically, pesticide monitoring involves laborious analytical methods. Many analytical methods for the extraction and analysis of pyrethroids in the soil based on green analytical chemistry have been proposed [8, 15, 19, 20]. However, the extraction of tropical soil of tea plantation was performed only once , and the method was time-consuming, required large volumes (up to 100 mL) of organic solvents, such as acetone and dichloromethane, and used large amount of samples, thus generated massive amounts of laboratory waste during analysis. Therefore, the aim of this study was to develop an analytical method to monitor synthetic pyrethroids in a soil of Indonesian tea plantation and to assess their associated ecotoxicological risks. In this study, (i) a method for monitoring pyrethroids in the soil based on green analytical chemistry was developed and validated, (ii) distribution of pyrethroids in the soil of tea plantation was monitored, and (iii) ecotoxicological effects of pyrethroids were assessed by estimating the maximum equilibrium concentration expected in water (ECEWmax) value.
Materials and methods
Apparatus and chemical
Synthetic pyrethroids (see Table S1, Additional file 1), were quantified using the Agilent 7890B gas chromatography system coupled with a micro-electron capture detector (GC-μECD). Pyrethroids were separated using an HP-5 Agilent column (30 m × 0.32 mm × 0.25 μm). Sample injection was performed at the injector temperature of 250 °C and injection volume of 1 μL. The oven temperature was initially set at 200 °C (held for 1 min) and then increased to 280 °C at 20 °C min− 1 (held for 8 min) . The detector temperature was set at 300 °C.
n-hexane and anhydrous sodium sulfate were obtained from Merck, Darmstadt, Germany. Analytical-standard fenvalerate (99.5%), cypermethrin (99.2%), permethrin (99.6%), deltamethrin (99.3%), and lambda-cyhalothrin (99.5%) were purchased from Chem Service, West Chester, USA. Individual stock solutions were prepared by diluting each standard pesticide in n-hexane at 100 mg L− 1. A mixed stock solution of lambda-cyhalothrin, permethrin, cypermethrin, fenvalerate, and deltamethrin was prepared in n-hexane at 5 mg L− 1. Serial dilutions containing a mixture of standard solutions were prepared in n-hexane.
Soil sampling and preparation
Blank soil for method validation was collected from the nearest area of the tea plantation with no history of pyrethroids (A0) and the soil samples were randomly collected from 11 locations in a tea plantation in the Upper Citarum Watershed (Fig. 1). These 11 sampling locations (A1 − A11) were chosen because of their proximity to the tributary river that will flow into the Citarum River.
Using soil probes, pooled topsoil (0–20 cm) samples were collected from five sampling points from each location (one each from all corners and one from the center of the field), then mixed thoroughly to make a representative composite sample. In this study, a total 12 soil mixed composite samples were collected from each season, and from each, triplicate sample were made for pyrethroid analysis.
The elevation ranged from 1193 m at the lowest point to 1411 m at the highest point. Soil sampling was conducted twice in March and July 2019, representing the wet and dry seasons, respectively, according to the monthly rainfall data for the sampling locations over the last 10 yr obtained from Automatic Weather Stations.
The samples were labeled and transported to the laboratory before physical and chemical examinations. Before extraction, the samples were air-dried at room temperature for 24 h, ground, and sieved through 0.5 mm mesh (Mesh Number 35). The samples were stored in dark glass jars in a freezer at a temperature below − 4 °C.
Physicochemical properties of soil samples
Mineral soil was identified via scanning electron microscopy coupled with energy-dispersive X-ray spectrometry (SEM-EDS) and X-ray diffraction (XRD). Soil pH and conductivity were measured in a 1:5 mixture of soil:distilled water using a pH meter and conductivity meter (Model TOA DKK MM-60R), respectively, according to Soil Survey Staff . Total organic carbon content was measured using the conventional Walkley-Black method .
Pyrethroids extraction and quantification
Wet weight of soil was used in this experiment. Prior to ultrasound-assisted extraction, each soil sample (5 g wet weight) was weighed into a centrifuge tube (50 mL) and 20 mL n-hexane was added. The tube was capped and sonicated for 30 min in an ultrasonic bath and centrifuged at 4000 rpm for 5 min. Extraction was performed twice, and the supernatant (organic layer) was separated. Then, 1-mL aliquot of the combined supernatant was transferred to a column containing a small piece of glass wool and anhydrous sodium sulfate to remove water before being injected into the GC-ECD column.
Performance of the proposed method was validated by estimating linear range, limit of detection (LoD), limit of quantitation (LoQ), repeatability, and percent recovery of each pyrethroid. Linear range was analyzed by adding (spiked) the soil sample with pyrethroids at seven concentrations, ranging from 0.01 to 0.2 mg g− 1. LoD and LoQ values were estimated on the basis of signal-to-noise ratios, which were 3 and 10, respectively, for the blank soil sample (no spiked) [23, 24]. Repeatability was calculated as relative standard deviations (RSD) of seven replicates of blank soil added with pyrethroids at 0.1 μg g− 1. Percent recovery was analyzed by adding the blank soil with pyrethroids at several concentrations (0.01–0.2 μg g− 1). The matrix effect (ME) was analyzed by comparing standard calibration curve and matrix-match calibration curve (as in linear range), using the following Eq. (1) :
A negative value indicates signal suppression due to the matrices, whereas a positive value indicates signal enhancement. Moreover, a value < 20% indicates low matrix interference, whereas a value > 20% indicates high matrix interference .
In this study, risk assessment for each pyrethroid was performed by estimating its concentration in the soil that might be washed off through leaching and runoff to surface water by calculating the ECEWmax (μg L− 1) value using the following Eq. (2) ):
ECEWmax represents the probable concentration of each compound in surface water, and Kd (L kg− 1) is the adsorption coefficient of each compound estimated by the following Eq. (3):
The organic carbon soil partition coefficient (KOC) was obtained as described previously  (Table 1), and the organic carbon content (OC) (g kg− 1) was determined through primary assessment of topsoil from each sampling point. The ECEWmax value was compared with LC50 for each aquatic species inhabiting the Upper Citarum River. LC50 values for each species were obtained from secondary data derived from several previous studies as listed in Table 2.
Results and discussion
Efficiency of the proposed method
The estimated LoQ using the proposed method was 0.03 μg g− 1 for lambda-cyhalothrin, 0.1 μg g− 1 for permethrin, 0.05 μg g− 1 for cypermethrin, 0.04 μg g− 1 for fenvalerate, and 0.02 μg g− 1 for deltamethrin. The estimated LoD ranged from 0.006 μg g− 1 for deltamethrin to 0.04 μg g− 1 for permethrin. The Food and Agriculture Organization, through the Codex Alimentarius, and EU have established the maximum residue levels (MRLs) of all types of pyrethroids in food; however, MRLs of pyrethroids in soil have not been established. The repeatability (% RSD) of the method was 7.5–13.5%. Calculated repeatability of the method (% RSD) was 7.5–13.5%, which was acceptable, being less than 2/3 of the corresponding coefficient variation (CV) in Horwitz’s equation. Mean percent recovery of each compound (Table 3) was within the specific range (80–110%) determined by Association of Official Analytical Chemists International .
Linearity of the method was evaluated by spiked soil samples with pyrethroids standards at seven concentrations (0.01–0.2 μg g− 1). The coefficient correlations (r) ranged from 0.9963 to 0.9988 (Fig. 2), indicating good linearity. ME of soil on chromatographic signals was also assessed. This was an important aspect of the study because matrix interference is a major problem in the analysis of pesticide residues as it can either enhance or suppress the chromatographic signals, eventually leading to inaccurate recovery estimations [25, 41]. Using Eq. (1), ME was estimated by comparing the slope of the linear equation of standard solutions to the slope of the linear equation of matrix match-calibration with different pyrethroid concentrations (μg g− 1 values were converted to equivalent μg L− 1 values) (Fig. 2).
Matrix interference for most pyrethroids was determined to be low (< 20%); for permethrin, matrix interference was determined to be moderate (> 20%). Estimation of matrix interference using the proposed analytical method in this study represents how anonymous compounds in the tropical soil of tea plantation interfere with the determination of pyrethroids. In conclusion, all parameters of the proposed method met the acceptance limits, and the method was thus deemed acceptable for the assessment of pyrethroids in real soil samples.
Pyrethroid residues in the soil
A total of 11 soil samples and one blank sample collected from each sampling location in each season were analyzed for the presence of five pyrethroids (lambda-cyhalothrin, permethrin, cypermethrin, fenvalerate, and deltamethrin) using the validated proposed method (Table 3). Less SD values shown in Table 4 indicate the replicability of the method since each sample was analyzed in triplicates. Only permethrin and deltamethrin were detected at most sampling locations (Table 4). The absence of the other pyrethroids assessed on this study was probably due to their low amount of application. The application of pyrethroids in the study area was dependent on the type of pests and diseases attack during plantation thus some are used more than others. Deltamethrin and permethrin were used dominantly in the study area, with the monthly average area sprayed by the deltamethrin was 140 ha or equal to 63% from the total area of sampling location. Whereas, only 8 ha or equal to 3% of the total area of sampling location that was sprayed by the permethrin. The dose for deltamethrin and permethrin were 0.15 and 0.1 kg ha− 1 respectively, and applied only when pests and diseases were present.
The average concentrations of both pyrethroids in soils were higher in the wet season (Table 4). Surprisingly, this finding is contrary to most reported findings. For instance, Delgado-Moreno et al.  suggested that pyrethroids were more persistent in the dry season when the precipitation was low. Similarly, previous studies have reported enhanced runoff of herbicides from soil surfaces at high rainfall intensities [42, 43] thus, pyrethroids were rarely detected in wet season.
At most locations, the concentrations of permethrin residues were higher than that of deltamethrin residues. Permethrin concentration ranged from below LoD to 0.36 μg g− 1, whereas deltamethrin concentration ranged from below LoD to 0.12 μg g− 1. However, as MRLs of permethrin and deltamethrin in soil have not been established, this result could not be compared to any regulation.
In this study, the absence of deltamethrin in the dry season might be due to its relatively high rate of photolysis represented by its relatively shorter photolysis and degradation half-life compared to permethrin . In comparison to permethrin, deltamethrin has a shorter photolysis half-life (34.7 d) and a shorter soil degradation half-life of 24–29 d, whereas, the half-life for photolysis and soil degradation of permethrin was 104 and 39.5–197 d, respectively. Apart from leaching from soil and entering surface water, this pesticide may be lost to the atmosphere because of high temperatures in tropical regions . Although pyrethroids are less volatile than other pesticides , deltamethrin has a shorter photolysis half-life and shorter degradation half-life than other pyrethroids . This may explain the lower concentrations of deltamethrin in the wet season and its complete below the detection limit at all sampling locations in the dry season.
The lower intensity of application of both pyrethroids in the dry season might also contribute to the absence of deltamethrin. Whereas for permethrin, the lowest concentration (< LoQ) of this compound at several location sampling during the dry season such as A1, A2, A4, and A11 (see Table 4) might be due to insignificant area of the sampling location that was sprayed by the permethrin during the dry season. The intensity of pyrethroids application in the sampling locations examined depended on the intensity of rainfall and the occurrence of attacks by pests and diseases. The rainfall intensity was up to 328.9 mm month− 1 in the wet season and 110.3 mm month− 1 in the dry season with more frequent spraying in the wet season.
Conversely, during the wet season, almost all of the sampling locations were sprayed by permethrin except for the location where the pests and diseases did not exist such as at A1, A4, and A9. For instance, only half of A1 and one-third of A4 were sprayed by permethrin. However, due to limited record of pesticide application this assumption cannot be concluded and further research is needed.
The fate and distribution of pyrethroids in the soil, that is whether they persist, degrade, or are washed off through leaching, depend on soil characteristics, climate, and soil microbiome [12, 16, 20, 46]. Soil properties impact on pyrethroid persistence in many ways. Typically, pyrethroids are more persistent in soils with a lower pH. Deltamethrin degradation is higher at a pH of 3 , and higher pH (pH = 9) might hydrolyze permethrin . In this study, the sampled soil showed similar pHs in both seasons, ranging from pH 5.2–6 (Table 5). Permethrin and deltamethrin are relatively stable at this range and their hydrolyzation is unlikely .
Furthermore, the hydrophobicity of each pyrethroid, as represented by its octanol/water partition coefficient (KOW) and water solubility, affects its mobility. As permethrin has a higher KOW and a lower soil adsorption coefficient than deltamethrin , its concentration in soil was expected to be lower than that of deltamethrin. Surprisingly, in this study, permethrin concentrations were higher than deltamethrin. To explain these phenomena, the sampled soil was characterized through SEM-EDS and XRD, which revealed the presence of several elements such as Si, Ca, Al, K, Fe, and O and major soil minerals such as quartz, anorthite, microcline, carborundum, magnetite, zeolite, and potassium calcium silicate (see Data S1 and S2, Additional file 1). These soil minerals in combination with high total organic carbon content increase the adsorptivity of soil particles for pyrethroids .
In the studied region, the total organic carbon content of the soil was relatively high, ranging from 30.4 to 62.3 g kg− 1 (Table 5), rendering permethrin was more persistent in the soil. Conversely, deltamethrin is less hydrophobic than permethrin (lower KOW and higher KOC; Table 1). The higher content of organic carbon in soil will lower the degradation rate of deltamethrin , and the low adsorption of deltamethrin on soil particles will eventually make deltamethrin washed off through leaching.
So far, there has been only one study exploring the presence of pyrethroids in the soil of tea plantation, e.g., in India , but unfortunately, none of synthetic pyrethroids were detected in the soils of that region, therefore, pyrethroid levels detected in the present study were compared with those in other studies that successfully detected pyrethroid residues in soils from various tropical ecosystems. In previous studies conducted in different types of tropical plantation [13, 15,16,17], deltamethrin was detected in cotton/wheat soil (6 × 10− 5 − 1.8 μg g− 1), chestnut soil (< LoD – 0.03 μg g− 1), walnut soil (< LoD – 0.02 μg g− 1), pine-nut soil (< LoD – 0.005 μg g− 1), cabbage soil (0.007–0.008 μg g− 1), and cacao soil (0.04 μg g− 1). Meanwhile, permethrin has never been detected in plantation soils but it was detected in rivers near the plantation (< 100 μg L− 1) .
The monitoring of synthetic pyrethroids in the soil of tropical tea plantation, particularly in the Citarum Watershed, Indonesia, is challenging in the light of the conservation and restoration program for the Citarum River proposed by the government. The purpose of this assessment was to determine the toxicity of pyrethroids retained in the soil of tea plantation leaching to surface water. Introduction of pyrethroids into surface water through runoff and leaching might negatively affect aquatic organisms. Using mean total organic carbon content and mean concentration of each pyrethroid in the sampled soil, the ECEWmax values for permethrin and deltamethrin in surface water in the wet season were 0.024 and 0.004 μg L− 1, respectively. Meanwhile, the ECEWmax value for permethrin in the dry season was 0.019 μg L− 1. This pattern was similar to that observed in a previous study in the Mekong Delta by Toan et al. , that were frequently detected high concentrations of pyrethroids in surface water following heavy rainfall.
Although pyrethroids are considered to be slightly toxic to mammals and birds, they exhibit high acute and chronic toxicity in aquatic organisms . Several studies have demonstrated that the Upper Citarum River is home to aquatic organisms from the lowest to the highest trophic levels, including algae of the family Bacillariophyceae, planktonic crustaceans such as Daphnia sp., and 10 species of fish [48,49,50]. Toxicological properties of permethrin and deltamethrin in some of these species are presented in Table 2.
Notably, the ECEWmax values for permethrin and deltamethrin were below the toxicity threshold for each aquatic organism. The LC50 values for fish exposed to deltamethrin and permethrin were higher than the ECEWmax values estimated in this study (Table 2); thus, no toxic effects were expected. Our estimation revealed that the maximum threshold for permethrin concentration retained in the soil of tea plantation representing the safe limit for aquatic organisms inhabiting in the Upper Citarum River was 136 μg g− 1 for algae, 0.84 μg g− 1 for Daphnia sp., and 366 μg g− 1 for fish. Meanwhile, the maximum threshold for deltamethrin concentration representing the safe limit was 8.0 μg g− 1 for Daphnia sp. and 0.27 μg g− 1 for fish. The half-life of permethrin in soil, under either aerobic or anaerobic conditions, is relatively short, ranging from 39.5 to 197 d (Table 1) and it is even shorter for deltamethrin. Therefore, as long as there is no significant leaching or runoff caused by heavy rainfall, both permethrin and deltamethrin are expected to either persist or naturally degrade in soil. Due to the strong affinity of permethrin for soil particles and solid surfaces and the high bioavailability of deltamethrin, further research into pyrethroid remediation using indigenous microbes in the tropical soils of tea plantation is highly recommended.
The developed method for detecting and analyzing pyrethroids in tropical soils of a tea plantation was validated and deemed suitable for monitoring pyrethroid in soil during wet and dry seasons. Contrast to most reported findings, permethrin was more persist than deltamethrin both in wet and dry seasons due to the combination of several elements exist in the soil and high total organic carbon content. Risk assessment of the presence of permethrin and deltamethrin in surface water by estimating the ECEWmax values showed that each compound was present at a concentration lower than the LC50 value for any aquatic organism inhabiting the Upper Citarum River.
Availability of data and materials
All the data are provided in the manuscript and additional file.
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The authors wish to thank Puput Febrianto for his help for map preparation.
This research was supported by the Ministry of Research Technology and Higher Education, Indonesia under INSINAS 2019 Research Grant Programme [contract number 047/P/RPL-LIPI/INSINAS-1/II/2019] and Indonesian Institute of Sciences under DIPA 2019 Research Grant.
The authors declare they have no competing interests.
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Pyrethroid properties and soil characterization. Table S1. Properties of pyrethroids. Data S1. Soil characterization by scanning electron microscopy coupled with energy-dispersive X-ray spectrometry (SEM–EDS). Data S2. Soil characterization by X-ray diffraction (XRD)
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Ariyani, M., Pitoi, M.M., Koesmawati, T.A. et al. Pyrethroid residues on tropical soil of an Indonesian tea plantation: analytical method development, monitoring, and risk assessment. Sustain Environ Res 30, 15 (2020). https://doi.org/10.1186/s42834-020-00055-7
- Tea plantation
- Risk assessment
- Green analytical chemistry