Abstract：
Rice intake represents a significant pathway through which humans accumulate heavy metals. This study presents a comprehensive analysis of heavy metal and pesticide contamination in rice cultivars irrigated with industrial wastewater near Dhaka, Bangladesh, a region heavily influenced by industrial activities. This study employed a unique methodology that not only quantified the concentrations of heavy metals and pesticide residues in rice grains but also extended to evaluating the physicochemical properties of rice stems, husks, soil, and irrigation water. The findings revealed alarmingly high levels of heavy metals such as lead, cadmium, chromium, nickel, and mercury in the soil and irrigation water, with concentrations in some cases exceeding the World Health Organization safety thresholds by 2 to 15 times. Notably, the rice grains also exhibited significant contamination, including substantial amounts of diazinon and fenitrothion pesticides, exceeding the established safety limits. The study employed hazard quotients (HQs) and cancer risk (CR) assessments to evaluate the potential health risks associated with the consumption of contaminated rice. The results indicated HQ values were greater than 1 for rice grains across the sampled fields, suggesting a considerable non-carcinogenic health risk, particularly from lead exposure, which was found at levels twice the standard limit in all the sampling fields. Moreover, the CR values for As, Pb, Cd, Co, and Mn highlighted a significant carcinogenic risk in several instances.
摘要：
大米的摄入代表了人类积累重金属的重要途径。这项研究提供了在达卡附近用工业废水灌溉的水稻品种中重金属和农药污染的综合分析，孟加拉国,受工业活动影响很大的地区。这项研究采用了一种独特的方法，不仅量化了稻谷中重金属和农药残留的浓度，而且还扩展到评估稻茎的理化性质。外壳,土壤,灌溉用水。调查结果显示，铅等重金属含量高得惊人，镉,铬,镍,土壤和灌溉水中的汞，在某些情况下，浓度超过世界卫生组织安全阈值的2至15倍。值得注意的是,稻谷也表现出显著的污染，包括大量的二嗪农和非尼托硫农药，超过既定的安全限制。该研究采用危害商（HQs）和癌症风险（CR）评估来评估与食用受污染大米相关的潜在健康风险。结果表明，整个采样田地的稻谷HQ值大于1，表明了相当大的非致癌健康风险，特别是铅暴露，在所有采样字段中发现的水平是标准限值的两倍。此外，As的CR值，Pb,Cd,Co,锰在几个例子中强调了显著的致癌风险。
