高砷煤矿废水灌溉区土壤砷的分布特征探究

通过对贵州兴仁县交乐村高砷煤矿废水灌溉区土壤总砷的分布特征进行研究。文章对土壤总砷、pH值及有机质含量进行了分析,结果表明,污灌区土壤砷的含量最高达237.55mg/kg,最低为24.20mg/kg,平均As含量为85.62mg/kg,均高于世界、中国及贵州黄壤中的平均水平;pH平均值为5.12,属酸性土壤;有机质含量普遍偏高;高砷煤矿废水灌溉导致了灌区土壤中砷的累积。灌溉方式影响了土壤中砷的迁移与分布情况,土壤中砷的含量,随着与灌溉水源距离的增加而急剧降低。研究区土壤中砷的迁移较缓慢,但有向下游逐渐扩散的趋势。土壤总砷含量受到了pH值和有机质影响,但与两者的相关性并不明显。

Characteristics of Arsenic Distributing in Soils Irrigated by High-arsenic Coal Drainage

Characteristics of arsenic distributing in soils irrigated by high arsenic coal drainage were studied in Jiaole Village,Xingren County of Guizhou Province.Total arsenic,pH and total organic matter (TOM)were analyzed,results indicated that concentration of arsenic was the highest as 237.55mg/kg and lowest as 24.20mg/kg,with average concentration as 85.62mg/kg,which were higher than average level of yellow soil for the world,China and Guizhou Province.Average pH which was 5.12 belongs to acid soil,and content of TOM was generally high.Accumulation of arsenic in soils attributed to irrigation with drainage which was from high arsenic coal mine.Transferring and distributing of As in soil were affected by mode of irrigation.Concentrations of arsenic in soil decreased sharply with increasing distance from irrigating drainage.Although arsenic moved quite slowly in the study soils,a trend of pervasion downstream for arsenic has been revealed in a large scale.While the contents of arsenic were affected by pH and TOM,but it was not evident related to pH or TOM.