摘要
应用AA3型连续流动分析仪测定了土壤和植物中全磷。结果表明:对于采用高氯酸-硫酸消解的土壤样品以及硫酸-过氧化氢消解的植物样品,在测定时调节反应混合液的酸度使其在显色的适宜范围内,磷的质量浓度在6 mg.L-1(土壤)和7.5 mg.L-1(植物)以内呈线性,相关系数分别为0.999 2(土壤)和0.999 6(植物);加标回收率98.5%～100.5%,相对标准偏差小于2%,检出限分别为0.010 mg.L-1(土壤)和0.013 mg.L-1(植物)。
The AA3 continuous flow analyzer （CFA） was applied to the determination of total phosphorus in soil and plants. Sample of either the soil or the plant was pretreated by drying at 60 ℃ and grinding to pass through screen with mesh of 0. 25 mm. The pretreated sample was digested with HC104-H2SO4 mixture for soil sample and with H2SO4-H2O2 mixture for plant sample. An aliquot of the sample solution was taken, and the acidity of solution in the reaction coil was controlled at c（1/2 H2SO4 ）：0. 39 mol · L^-1. Molybdenum blue photometric method was adopted in CFA, and wavelength of 660 nm was used for absorbance measurements （in terms of peak heights）. Linearity was kept both in analysis of soil and plants, giving correlation coefficients （r） of 0. 999 2 and 0. 999 6, with detection limits of 0. 010 mg·L^-1 and 0. 013 mg·L^-1 respectively. Values of RSD （n= 6） and recovery obtained were less than 20% and in the range of 98. 0%-100. 5%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2007年第8期649-652,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
国家自然科学基金资助项目(No:30230230)
关键词
磷钼蓝光度法
连续流动分析仪
全磷
植物
土壤
Phospho-molybdenum blue-photometry
Continuous flow anal yzer
Total phosphorus
Plants
Soil
