河南省主要土类土壤耕层砷(As)含量的调查

Sample Investigation of Arsenic (As) Content in Main Topsoil of Henan Province

抽样调查了河南省分布的主要土类耕层土壤100个土样,对其土壤类型、质地、有机质含量、pH值进行了测定,并用王水-高氯酸消解、电感耦合等离子体发射光谱仪对土壤样品中的砷含量进行了测定。结果表明,主要土类中砷含量平均值大小顺序为砂姜黑土>潮土>黄褐土>黄棕壤>红黏土>褐土,砷含量平均分别为10.75mg/kg,9.92mg/kg,7.40mg/kg,4.89mg/kg,5.34mg/kg,4.89mg/kg,均低于国家土壤环境质量标准(GB15618-1995)中规定的砷含量≤25mg/kg。

A sample investigation was carried out with 100 main topsoil samples in Henan. The soil types, texture, organic contents and pH of the samples were determined. And the As content was detected by digestion with aqua regia- perchloric acid and using inductive coupling plasma emission spectrograph （ICP-OES）. The results show that the As content varies among the soil types, with the order of mean content as lime concretion black soil〉alluvial soil〉yellow brown soil〉 yellow cinnamon soil〉 red clay〉cinnamon soil. The average Ni content is 10.75 mg/kg, 9.48 mg/kg,8.80 mg/kg,8.46 mg/ kg,5.34 mg/kg and 4. 84 mg/kg respectively, lower than the As content required in national Soil Environmental Quality Standard （GB 15618--1995） with that less than or equal to 25 mg/kg.