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采用王水消解及逐级浸提技术,以氢化物发生-原子荧光法对成都东郊稻田土中的Sb形态进行了分析,方法检出限为0.108μg/L,回收率为96.9%～104.8%。加入硫脲-抗坏血酸溶液后,土壤样品中可能存在的金属离子Cu2+、Co2+、Se4+、Sn2+、Zn2+、Pb2+、As3+、As5+、Hg2+对Sb的干扰可以有效地消除;样品Sb含量在0.92～2.52 mg/kg之间波动,平均值为1.76 mg/kg,与四川省土壤Sb背景浓度(≈1.70 mg/kg,1991)相比相差不大。水平方向上,各形态Sb的浓度因所处稻田条件的不同而分布各异,大体呈以下规律:残渣态﹥有机/硫化物结合态﹥铁/锰氧化物结合态﹥碳酸盐结合态﹥可交换态,易被植物吸收利用的可交换态占的比率最小;垂直方向上,各形态随着土壤深度的增加,呈递减趋势。
Using the method of aqua regia digestion and stepwise leaching, the Sb speciation in paddy soils of eastern suburbs of Chengdu was analyzed by hydride generation-atomic fluorescence. The detection limits were 0.108 μg / L and the recoveries were 96.9% -104.8 %. With the addition of thiourea-ascorbic acid solution, the interference of Cu2 +, Co2 +, Se4 +, Sn2 +, Zn2 +, Pb2 +, As3 +, As5 + and Hg2 + on Sb in soil samples can be effectively eliminated. The Sb content in samples ranged from 0.92-2.52 mg / kg fluctuating with an average of 1.76 mg / kg, which is not different from the background concentration of Sb in soils of Sichuan (≈1.70 mg / kg, 1991). In the horizontal direction, the concentrations of Sb in various forms are distributed differently depending on the conditions of the paddy fields in which they are located, and are generally in the following order: residual state> organic / sulfide bound state> iron / manganese oxide bound state> carbonate bound state> Exchangeable, easy to be absorbed by plants exchangeable accounted for the smallest proportion; vertical direction, the shape of the soil depth as the increase, showing a decreasing trend.