Dataset for: Joint probabilistic analysis of risk for aquatic species and exceedence frequency for the agricultural use of chlorpyrifos in the Pampean region, Argentina

The Pampa H?meda region in Argentina is characterized by soybean, wheat, and maize production, with intensive application of agrochemicals such as herbicides and insecticides. We used a joint probabilistic approach to analyze the probabilities for environmental chlorpyrifos concentrations measured in the Pampa H?meda to exceed acute or chronic Hazard Concentration-5 (HC5) values estimated from Species Sensitivity Distributions (SSD) for aquatic species. Chlorpyrifos concentrations in water ranged from 0.0005 to 10.8 ?g/L with a median of 0.013 ?g/L. The HC5 limits were 0.0637 ?g/L for acute and 0.0007 ?g/L for chronic effects. The probabilities for chlorpyrifos environmental concentrations to exceed the HC5 values ranged from 35% (acute effects) to 96% (chronic effects). Water Quality Criteria (WQC) for the protection of aquatic life were also frequently exceeded (48%-87%) for both acute and chronic effects. Together with published threshold limit values from mesocosm studies, these data suggest that macroinvertebrate communities can be severely affected by the reported environmental concentrations of chlorpyrifos. Indeed, changes in the macroinvertebrate assemblage in the Pampa H?meda have been correlated with chlorpyrifos levels in sediments. Nevertheless, the actual impact needs to be ascertained by assessing the recovery rate of macroinvertebrate populations in this region. Considering the HC5 for chronic effects and the threshold limits for macroinvertebrate community level effects, we propose 0.7 ng/L as a new WQC to effectively protect aquatic life from long-term exposure to chlorpyrifos.

阿根廷的潘帕哈梅达地区以其大豆、小麦和玉米的种植而著称，农业化学品如除草剂和杀虫剂的密集使用是该地区的一大特征。本研究采用联合概率方法，分析潘帕哈梅达地区测量的环境氯吡硫磷浓度超过由水生物种敏感性分布（SSD）估计的急性或慢性危害浓度-5（HC5）值的概率。水中氯吡硫磷浓度范围为0.0005至10.8纳克/升，中位数为0.013纳克/升。急性效应的HC5限值为0.0637纳克/升，慢性效应的限值为0.0007纳克/升。氯吡硫磷环境浓度超过HC5值的概率范围为35%（急性效应）至96%（慢性效应）。为了保护水生生物，水质标准（WQC）在急性效应和慢性效应的情况下也常常被超过（48%-87%）。结合来自中宇宙研究的已发表阈值限值，这些数据表明，大型无脊椎动物群落可能会受到报告的环境氯吡硫磷浓度的严重影响。实际上，潘帕哈梅达地区大型无脊椎动物群落的组成变化与沉积物中的氯吡硫磷水平相关。然而，实际的冲击需要通过评估该地区大型无脊椎动物群落的恢复率来确认。考虑到慢性效应的HC5值和大型无脊椎动物群落水平效应的阈值限值，我们建议将0.7纳克/升作为新的WQC，以有效保护水生生物免受氯吡硫磷长期暴露的影响。