比浊法快速测定土壤中速效钾的研究进展  

Research Progress of Rapid Detection for Available Potassium in Soil by Turbidimetry

作　　者：杨张青 辛银平 赵晴[1,2] 王猛 秦一浪[1,2] 胡峰 李国强 YANG Zhangqing;XIN Yinping;ZHAO Qing;WANG Meng;QIN Yilang;HU Feng;LI Guoqiang(Institute of Agricultural Information Technology,Henan Academy of Agricultural Sciences,Zhengzhou 450008;Henan Engineering and Technology Research Center for Intelligent Agriculture,Zhengzhou 450008;Zhengzhou University Environmental Technology and Consulting Engineering Co.Ltd.,Zhengzhou 450002)

机构地区：[1]河南省农业科学院农业信息技术研究所,郑州450008 [2]河南省智慧农业工程技术研究中心,郑州450008 [3]郑州大学环境技术咨询工程有限公司,郑州450002

出　　处：《中国农学通报》2024年第9期83-88,共6页Chinese Agricultural Science Bulletin

基　　金：2023年河南省科技攻关“光纤耦合LED原位在线土壤养分光学传感器研发”(232102111130)。

摘　　要：建立了比浊法快速检测土壤中速效钾的方法,以NaHCO_(3)-Na_(2)SO_(4)-NaOH-DTPA溶液为土壤速效钾浸提剂,用0.02 mol/L硫酸铜溶液掩蔽铵根离子,0.20 mol/L乙二胺四乙酸二钠溶液络合体系中金属离子以消除干扰;浊度液反应10 min后在680 nm处上机测定。结果表明:土壤速效钾工作直线区间为1.30×10^(-5)~3.12×10^(-4) mol/L,检出限为2.29×10^(-6) mol/L。对土样速效钾进行加标回收试验,回收率为90.71%~109.14%,相对标准偏差RSD为2.61%~4.32%。对新疆、内蒙古、四川、湖南及河南等6个地区161个土样中速效钾含量进行测定,并与NY/T889-2004火焰光度计法进行对比分析,两者线性回归方程为y=0.6437x-3.5714,相关系数r为0.9732。结果表明,本方法可推广应用于土壤速效钾快速检测。A turbidimetry-based method was developed to rapidly detect available potassium in soil.The solution of NaHCO_(3)-Na_(2)SO_(4)-NaOH-DTPA was used to extract soil available potassium,the solution of 0.02 mol/L cupric sulfate was used to mask ammoniumion,and the solution of 0.20 mol/L EDTA acid disodium salt was used to eliminate the interference of metal ions.The soil turbidity solution was determined at 680 nm after 10 min of reaction time.The result showed that the range of available potassium was from 1.30×10^(-5) to 3.12×10^(-4) mol/L,and the detection limit was 2.29×10^(-6) mol/L.The recovery rate of soil available potassium was 90.71%-109.14%,and RSD was 2.61%-4.32%.The available potassium was determined in 161 soil samples from Xinjiang,Inner Mongolia,Sichuan,Hunan and Henan Provinces.Compared with the flame photometer method in NY/T889-2004,the regression equation was y=0.6437x-3.5714,and the correlation coefficient was r=0.9732.Overall,this method could be applied to the rapid detection of soil available potassium.

关 键 词：比浊法 土壤 速效钾 快速检测 

分 类 号：S-3[农业科学] S13