摘要
对AA3型连续流动分析仪测定土壤全磷的方法进行了试验研究。结果表明,通过调整试剂中的硫酸量使显色酸度在反应的适宜范围,该仪器能准确测定土壤样品中的全磷,与传统比色法的测定结果无显著差异,在线性区间,标准曲线r值可达到0.999以上,加标回收率为97.9%-102.1%,待测溶液最低检出限为0.012mg/L。
Determination method of soil total phosphorus by AA3 Continuous Flow Analytical System was investigated. The results showed that through sucking certain concentration sulfuric acid to the machine with another pump, instead of directly adding sulfuric acid to ammonium molybdate in order to moderate the pH of reaction solution, AA3 CFA can be used to assay soil total phosphorus accurately, and avoid the blue reaction after adding a little of sulfuric acid to the ammonium molybdate. The result of this method was not significantly different from the traditional colorimetry. In the linear area, the correlation efficiency for the standard curve was as high as over 0. 999, the recovery percentage of standard sample was 97.9 % - 102.1%, and the detection limit of the sample was 0. 012 mg/L.
出处
《干旱地区农业研究》
CSCD
北大核心
2007年第4期168-171,共4页
Agricultural Research in the Arid Areas
基金
国家自然科学基金重点项目"西北旱地作物高产优质高效栽培生理生态研究"(30230230)
关键词
连续流动分析仪
土壤全磷
水溶性磷
反应酸度
Continuous Flow Analytical System（CFA）
soil total phosphorus
soluble phosphorus
reaction acidity
