Comparison between Polar Organic Chemical Integrative Sampler (POCIS) and Grab Samples to Estimate Time-Weighted Average Concentrations of Paddy-Use Pesticide Residue in Stream Water

M. Sudo, Masato Kajihara, K. Iwama
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Abstract

In this study, the application of the polar organic chemical integrative sampler (POCIS) for the time-weighted average concentration (TWAC) of paddy-use pesticides in environmental water was evaluated. Two herbicides and one fungicide were selected and investigated by deploying POCIS and high-frequency grab sampling (more than two times per day) in three paddy drainage canals (2.8–70 ha) and one river in the Lake Biwa basin for 7–21 day periods. TWACs determined by POCIS and by high-frequency grab samples showed good agreement, and 11 of 14 datasets (79% of all datasets) were within the range of 0.5–2.0-fold difference. To generate estimates of TWAC at different sampling intervals, the high-frequency grab sampling data were subsampled at intervals of 1, 2, 3, 4, and 7days. On the basis of the comparison of TWACs between POCIS and different grab sampling intervals, it is considered that the sampling interval that yields equivalent TWACs to those of POCIS was more than once a week in datasets with low CVs of pesticide concentration (CV ≦ 100%),but more than three day intervals in databases with high CVs.
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极性有机化学综合采样器(POCIS)与抓取样本估算水稻田农药残留时间加权平均浓度的比较
本研究对极性有机化学一体化采样器(POCIS)在环境水体中稻田农药时间加权平均浓度(TWAC)的应用进行了评价。选取2种除草剂和1种杀菌剂,在碧瓦湖流域3条水渠(2.8 ~ 70 ha)和1条河流中采用POCIS和高频抓斗采样(每天2次以上)进行7 ~ 21天的调查。POCIS和高频抓取样本测定的TWACs具有良好的一致性,14个数据集中有11个(占所有数据集的79%)在0.5 - 2.0倍的差异范围内。为了获得不同采样间隔下TWAC的估计值,高频抓取采样数据每隔1、2、3、4和7天进行次采样。通过对POCIS与不同抓取采样间隔的twac的比较,认为在农药浓度低CV (CV≦100%)的数据集中,与POCIS产生相当twac的采样间隔大于一周一次,而在高CV的数据库中,采样间隔大于三天。
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