云南富源某地区土壤8种有效态元素的测定  

Determination of 8 Available Elements in Soil of Fuyuan,Yunnan Province

作　　者：冯俊 杨发忠 何袖辉 唐帅帅 胡斯涵 FENG Jun;YANG Fazhong;HE Xiuhui;TANG Shuaishuai;HU Sihan(Chemical Engineering College of Southwest Forestry University,Kunming,Yunnan 650000,China;Kunming Natural Resources Comprehensive Investigation Center of China Geological Survey,Kunming,Yunnan 650000,China)

机构地区：[1]西南林业大学化学工程学院,昆明650000 [2]中国地质调查局昆明自然资源综合调查中心,昆明650000

出　　处：《中国无机分析化学》2022年第6期61-66,共6页Chinese Journal of Inorganic Analytical Chemistry

基　　金：云南富源-贵州盘州能源矿产集中区生态修复支撑调查项目(DD20208075)。

摘　　要：一种DTPA土壤测试被成功开发并应用到云南富源某地区,以识别土壤中的有效锌、铁、锰、铜、铅、钴、镍和镉的含量,用于指导该地区的土壤施肥情况以获得作物的最大产量。提取剂由DTPA(二乙烯三胺五乙酸,0.005 mol/L)、三乙醇胺(0.1 mol/L)和CaCl_(2)(0.01 mol/L)混合组成,pH值为7.3。土壤测试包括用20 mL的提取剂震荡10 g风干土壤2 h,过滤滤液,用电感耦合等离子体发射光谱(ICP-OES)法测定滤液中的锌、铁、锰、铜、铅、钴、镍和镉。根据作物对锌、铁和锰等有效态的反应,土壤测试使用标准化的土壤准备、研磨和提取程序。提取剂在pH值7.30时得到缓冲,选用能有效地提取8种微量元素金属DTPA作为螯合剂。通过大量实验确定最佳的震荡时间是2 h,最佳的水土比是2∶1。通过实验,方法线性相关系数R>0.99,国家一级标准物质的准确度、精密度和检出限满足云南富源地区土壤检测要求,确定了此地的土壤检测方法,并通过加标回收实验,回收率在90.0%~110%。方法绿色环保、简单快捷、准确度高,适合该地区土壤有效态的分析。A DTPA soil test has been successfully developed and applied to a certain area in Fuyuan,Yunnan province,to identify the available zinc,iron,manganese,copper,lead,cobalt,nickel and cadmium contents in the soil,and to guide the soil fertilization in this area to obtain the maximum crop yield.The extractant was composed of 0.005 mol/L DTPA(diethylenetriamine pentaacetic acid),0.1 mol/L triethanolamine and 0.001 mol/L CaCl_(2) with pH 7.3.Soil tests included shaking 10 g of air-dried soil with 20 mL of extractant for 2 hours,filtering leachate,and determining zinc,iron,manganese,copper,lead,cobalt,nickel and cadmium in the filtrate by ICP-AES.Soil testing uses standardized soil preparation,grinding,and extraction procedures based on crop responses to available states such as zinc,iron and manganese.The extractant was buffered at pH 7.3 and DTPA,which can effectively extract 8 trace elements,was selected as chelating agent.Through a large number of experiments,it is determined that the best oscillation time is 2 h and the best water-soil ratio is 2∶1.Through experiments,the linear correlation coefficient R>0.99.The accuracy,precision and detection limit of the national first-class reference materials meet the requirements of soil detection in Fuyuan area of Yunnan province.The exact soil detection method is determined and the recovery is between 90.0%and 110%through the recovery experiment of adding standards.The method is green,simple,fast and accurate,which is suitable for the analysis of soil available state in this area.

关 键 词：二乙烯三胺五乙酸 有效态 ICP-OES 水土比 螯合剂 

分 类 号：O657.31[理学—分析化学]