Arsenic (As) is a human carcinogen,

Arsenic (As) is a human carcinogen, and arsenic contamination in groundwater is a worldwide public health concern. Arsenic-affected areas are found in many places but are reported mostly in agricultural farmlands, yet the interaction of fertilizers, microorganisms, and arsenic mobilization in arsenic-contaminated aquifers remains uncharacterized. This study investigates the effects of fertilizers and bacteria on the mobilization of arsenic in two arsenic-contaminated aquifers. We performed microcosm experiments using arsenic-contaminated sediments and amended with inorganic nitrogenous or phosphorus fertilizers for 1 and 4 months under aerobic and anaerobic conditions. The results show that microcosms amended with 100 mg/L phosphorus fertilizers (dipotassium phosphate), but not nitrogenous fertilizers (ammonium sulfate), significantly increase aqueous As(III) release in arsenic-contaminated sediments under anaerobic condition. We also show that concentrations of iron, manganese, potassium, sodium, calcium, and magnesium are increased in the aqueous phase and that the addition of dipotassium phosphate causes a further increase in aqueous iron, potassium, and sodium, suggesting that multiple metal elements may take part in the arsenic release process. Furthermore, microbial analysis indicates that the dominant microbial phylum is shifted from α-proteobacteria to β- and γ-proteobacteria when the As(III) is increased and phosphate is added in the aquifer. Our results provide evidence that both phosphorus fertilizers and microorganisms can mediate the release of arsenic to groundwater in arsenic-contaminated sediments under anaerobic condition. Our study suggests that agricultural activity such as the use of fertilizers and monitoring phosphate concentration in groundwater should be taken into consideration for the management of arsenic in groundwater.

結果 (繁體中文) 1:

砷（As）是一種人類致癌物和砷污染的地下水是一個世界性的公共衛生問題。砷影響的地區在很多地方都有發現，但據報導主要是在農業耕地，但肥料，微生物和砷污染的地下水砷動員的作用仍然未鑑定。本研究探討肥料和細菌對砷的兩個砷污染含水層的動員作用。我們使用砷污染的沉積物，用好氧和厭氧條件下無機含氮或磷的肥料1 4個月修訂進行縮影實驗。結果表明用100mg / L磷的肥料（磷酸氫二鉀）修正該縮影，但不含氮肥料（硫酸銨），顯著增加砷污染的沉積物水溶液作為（III）釋放厭氧條件下。我們還表明鐵，錳，鉀，鈉，鈣和鎂的是，濃度在水相中和，添加磷酸氫二鉀導致在水溶液鐵，鉀和鈉的進一步增加增加，這表明多個金屬元素可採取砷釋放過程的一部分。此外，微生物分析表明，佔主導地位的微生物門從α-變形菌到β-和γ-變形菌移位時的As（III）被增加和磷酸鹽在含水層中加入。我們的研究結果提供的證據表明，這兩種磷肥和微生物可以介導的砷釋放到地下水在厭氧條件下被砷污染的沉積物。

結果 (繁體中文) 2:

変えられるか?

結果 (繁體中文) 3:

砷（As）是一種人類致癌物質，地下水中的砷污染是一個世界性的公共衛生問題。受砷影響的地區在許多地方都有，但據報導大多是在農業農田，然而，在受砷污染的含水層中，肥料、微生物和砷動員的相互作用仍然沒有特徵。本研究探討肥料及細菌對兩個含砷含水層中砷活化的影響。在好氧和厭氧條件下，利用砷污染的沉積物進行了1個月和4個月的微觀實驗。結果表明，在厭氧條件下，施用100mg/L磷肥（磷酸二鉀）而不施用氮肥（硫酸銨）可顯著提高砷污染底泥中As（III）的釋放。我們還表明，鐵、錳、鉀、鈉、鈣和鎂的濃度在水相中新增，磷酸二鉀的加入導致水中鐵、鉀和鈉的進一步新增，這表明多種金屬元素可能參與砷的釋放過程。此外，微生物分析表明，隨著As（III）含量的新增和含水層中磷酸鹽的加入，優勢微生物門由α-蛋白細菌向β-和γ-蛋白細菌轉變。結果表明，在厭氧條件下，磷肥和微生物都能調節砷污染底泥中砷向地下水的釋放。我們的研究建議，在地下水砷的管理中，應考慮到農業活動，如使用肥料和監測地下水中的磷酸鹽濃度。