Forms and bio-availabilities of exogenous arsenic in purple soils

Abstract

Abstract: This study showed that after As was added into purple soils for 10 days,50.2%～61.1% of it transformed into residual As,occupying 68%～86% in original soils.For acid purple soil,the As forms were Al-As >Fe-As>Ca-As;for neutral purple soil,they were Ca-As>Al-As>Ca-As>Fe-As>A-As,and for calcic purple soil,they were Ca-As>Al-As>Fe-As>A-As.It is suggested that NH₄Cl could be used as common extractant for different soils,because it slightly affected original As forms in soils,and showed a highly significant correlation (P=0.01) to plant absorption.From pluralistic regressive analysis of plant As content and each As form,Al-As and Fe-As were the main available forms in acid purple soil,but A-As and Ca-As were the most important fractions in neutral and calcic purple soils.The study also showed that H₃BO₃ could restrain the F interference in the operation of As speciation separations.

Key words: Purple Soil, Arsenic, Form, Availability

CLC Number:

X171

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