In northern Sinaloa state, Mexico, little is known on organophosphate pesticide transport and fate in agricultural drainage systems. Spatial and temporal variation of chlorpyrifos and dimethoate was assessed in two agricultural drainage ditches (Buenaventura and Burrión) and risk for aquatic life was estimated. Analysis was made by high performance liquid chromatography and risk estimates were determined following international reference frameworks. In water, the highest chlorpyrifos concentration in the Buenaventura ditch was 5.49 µg L⁻¹, and 3.43 µg L⁻¹ in the Burrión ditch. Dimethoate was quantified only once in both ditches (0.44 µg L⁻¹ and 0.49 µg L⁻¹). In sediment, chlorpyrifos was quantified only in the Burrión ditch (242 µg kg⁻¹). Chlorpyrifos concentrations surpassed water and sediment quality criteria, representing a hazard for environmental and human health, as both ditches discharge into the Gulf of California and are used for capture of commercial species such as the grey mullet (Mugil cephalus) and cauque prawn (Macrobrachium americanum).

在墨西哥锡那罗亚州北部，人们对有机磷酸盐农药运输和农业排水系统中的命运知之甚少。在两个农业排水沟（Buenaventura和Burrión）中评估了毒死rif和乐果的时空变化，并估计了水生生物的风险。通过高效液相色谱进行分析，并根据国际参考框架确定风险估计。在水中，布埃纳文图拉沟中毒死rif的最高浓度为5.49 µg L ^-1，而Burrión沟中为3.43 µg L ^-1。在两个沟槽中仅对乐果进行了一次定量（0.44 µg L ^-1和0.49 µg L ^-1）。在沉积物中，毒死rif仅在Burrión沟中定量（242 µg kg ^-1）。毒死rif的浓度超过了水和沉积物的质量标准，对环境和人类健康构成危害，因为这两种沟渠都排入加利福尼亚湾，并用于捕获商业物种，例如鱼（Mugil cephalus）和鲍鱼虾（Macrobrachium americanum）。）。