The soil sample of a paddy field was found to be contaminated by copper (Cu). The application of wastewater as the nitrogen fertilizer was identified as the cause in this study. The concentration of Cu in soil and rice plants was therefore explored. The paddy soil characteristics indicated a strong anaerobic environment. The Cu concentration in topsoil was 123 ± 24 mg kg⁻¹. The Community Bureau of Reference (BCR)’s fractionation of Cu from high to low was residual fraction (62.1%) > organically bounded and sulfide-bounded fractions (24.2%) > iron oxide and manganese oxide fraction (8.8%) > acid-soluble fractions (4.8%). The concentration of Cu in rice organs was the highest in the roots, followed by the straw, grain, and husk. The correlation of Cu in rice straws with every fractionation of Cu in soil was strong. However, the weak correlation between Cu in rice grains and soil was found. The result of Cu mass balance in the soil–rice cultivation system showed that less than 0.1% of Cu was translocated to rice plant. The average Cu intake through rice grain consumption (621 μg day⁻¹) indicated the Cu supply to human body basic need without any potential negative health impacts to consumer. However, this level of Cu may cause toxicity to rice growth and productivity. Soil replacement may be more appropriate than soil treatment in this study. In addition, agricultural practices should be managed to prevent further contamination and promote more aerobic conditions.

中文翻译：

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污染稻田中水稻土和水稻中铜的分布初步研究

发现稻田的土壤样品被铜（Cu）污染。这项研究确定了废水作为氮肥的应用。因此，探索了土壤和水稻植物中的铜浓度。稻田土壤特性表明其具有较强的厌氧环境。表土中的铜浓度为123±24 mg kg ^-1。社区参考局（BCR）从高到低的Cu分离率是残留率（62.1％）>有机结合率和硫化物结合率（24.2％）>氧化铁和氧化锰率（8.8％）>酸-可溶部分（4.8％）。水稻器官中的铜浓度在根部最高，其次是稻草，谷物和稻壳。水稻秸秆中的Cu与土壤中Cu的各部分之间的相关性很强。然而，发现水稻籽粒中的铜与土壤之间的相关性较弱。在土壤-水稻栽培系统中，铜质量平衡的结果表明，只有不到0.1％的铜转移到水稻中。通过稻米消耗获得的平均铜摄入量（每天^621μg-1）表示满足人体基本需求的铜供应，而对消费者没有任何潜在的负面健康影响。但是，这种铜含量可能对水稻生长和生产力产生毒性。在这项研究中，土壤置换可能比土壤处理更为合适。此外，应管理农业实践，以防止进一步污染并促进更多有氧条件。