Chemistry

Environmental chemistry

Agronomy

Arsenic

Soil water

Organic chemistry

Biology

Environmental science

Mineral

Soil science

Phosphate

Biochemistry

The Science of The Total Environment

Arsenic (As) contamination was detected in paddy soils of Guangdong, China due to mining and weathering processes. Furthermore, As may be released into the soil and irrigation water during the application of phosphate (P). In this study, As behavior was assessed in three paddy soils (S6, S8 and TR) along the Hengshi river using batch and circular flow experiments with different phosphate application doses (0, 1, 5, 10, 50, 100 mg/L). The results indicate that pH variation (3–7) and higher phosphate concentrations in solution, can induce the release of As, with total As release ranked in the order: S6 > S8 > TR. In addition, AsV was the main state affected by phosphate in the circular soil solution. In particular, after 7 days of P10 application, the highest As concentration in S6, S8 and TR soil solutions reached 2298.4, 829.9 and 153.9 μg/L respectively, with the AsV state accounting for 93%, 97% and 18% of As. Some minerals were found to be generated in the middle container, most of which were amorphous iro...

Effect of phosphate on amorphous iron mineral generation and arsenic behavior in paddy soils