电感耦合等离子体原子发射光谱法同时测定石灰性土壤中的有效磷和有效硫

摘要

将土样5.00g加入0.5 mol·L-1 NaHCO3溶液50.0 mL中,在20～25℃下振荡提取30 min,用中速定量滤纸过滤,分取滤液5.0 mL,加入1.0mol·L-1HC1溶液5 mL稀释后,采用电感耦合等离子体原子发射光谱法测定其中的有效磷和有效硫,分析谱线为P 214.914 nm和S 182.034 nm.磷和硫的质量浓度均在10.0 mg·L-1以内与发射强度呈线性关系,检出限(3s)分别为0.15,0.29 mg·kg-1.加标回收率在95.2％～107％之间,测定值的相对标准偏差(n=12)在2.0％～3.6％之间.方法用于测定石灰性土壤中的有效磷和有效硫,结果与林业标准方法的测定结果一致.%The soil sample (5.00 g) was added into 50.0 mL of 0.5 mol · L-1 NaHCO3 solution and was extracted by oscillation at 20-25 ℃ for 30 min.After the solution was filtered with medium-speed quantitative filter paper,5 mL of 1.0 mol · L-1 HC1 solution was added in to 5.0 mL of the filter solution.The available phosphorus and available sulfur in the solution were determined by ICP-AES at P 214.914 nm and S 182.034 nm,respectively.Linear relationship were found between the emission intensity and the mass concentration of phosphorus and sulfur within 10.0 mg · L-1,with detection limit (3s) of 0.15,0.29 mg · kg 1 for available phosphorus and available sulfur respectively.Recovery rates obtained by standard addition method were in the range of 95.2％-107％,and RSDs (n=12) were in the range of 2.0％-3.6％.The poposed method was used to determined available phosphorus and available sulfur in calcareous soil,giving results in agreenment with those obtained by forestry standard method.