恒温震荡-阳离子树脂交换-电感耦合等离子体发射光谱法测定中性-石灰性土壤中有效磷
Determination of available phosphorus in neutral and calcareous soil using constant temperature oscillation-cation exchange resin-inductively coupled plasma optical emission spectrometry
摘要
建立了恒温震荡-阳离子树脂交换-电感耦合等离子体发射光谱法测定中性-石灰性土壤中有效磷的方法.对分析谱线、阳离子交换树脂用量、吸附时间、加入阳离子交换树脂对测定磷计数的影响以及测定过程中的谱线干扰问题进行了实验对比研究.结果表明,选取4.0 g阳离子交换树脂,交换30 min,钠离子的去除率达到99%.测定过程中,选择177.495 nm作为磷元素的最佳谱线.碳酸氢钠浸提出的土壤中的Al,Hf,Cu和Te含量较低,不会对磷元素产生光谱干扰,对测定有效磷含量基本无影响.该方法经土壤国家标准物质验证,有效磷测定结果均在标准值范围内,相对误差均小于5%,满足土壤样品分析检测的要求,适用于中性-石灰性土壤中有效磷含量的测定.
A method for determining available phosphorus in neutral-calcareous soils was established using constant-temperature oscillation-cation exchange resin-inductively coupled plasma optical emission spectrometry(ICP-OES).Comparative experimental studies were conducted on the analytical spectral lines,the dosage of cation exchange resin,adsorption time,the effect of adding cation exchange resin on phosphorus signal counts,and spectral interference during measurement.The results indicated that a sodium ion removal rate of 99%was achieved using 4.0 g of cation exchange resin with an exchange time of 30 min.The wavelength of 177.495 nm was selected as the optimal spectral line for phosphorus determination.The concentrations of Al,Hf,Cu,and Te extracted by sodium bicarbonate from the soil were very low,causing essentially no spectral interference on phosphorus determination and having negligible impact on the measured available phosphorus content.The method was validated using national standard reference materials for soils.The determined values of available phosphorus all fell within the certified ranges,with relative errors less than 5%,meeting the requirements for soil sample analysis and detection.This method is suitable for the determination of available phosphorus content in neutral-calcareous soils.
年，卷(期)：
2026, 45(7)
分类号：
O657.31
机标分类号：
O657.31
X142-33
S158.3
在线出版日期：
2026年7月30日
基金项目：
2021YFC2903001:国家重点研发计划，
