大量元素水溶肥料中矿物源黄腐酸含量的检测方法研究  

Study on the Detection Method of Mineral Fulvic Acid Content in Macroelement Water Soluble Fertilizer

作　　者：殷慧敏 刘学涛 杜建光 李鹏龙 肖凤龙 吴龙飞 王艳春 YIN Huimin;LIU Xuetao;DU Jianguang;LI Penglong;XIAO Fenglong;WU Longfei;WANG Yanchun(Linyi Inspection and Testing Center,Linyi,Shandong 276007,China;Shikefeng Chemical Co.,Ltd.,Linyi,Shandong 276007,China)

机构地区：[1]临沂市检验检测中心,山东临沂276007 [2]施可丰化工股份有限公司,山东临沂276007

出　　处：《肥料与健康》2022年第3期73-76,共4页Fertilizer & Health

基　　金：临沂市重点研发计划项目(2020WZ011)。

摘　　要：提出了测定大量元素水溶肥料中矿物源黄腐酸含量的方法。用pH约为1的硫酸溶液提取矿物源黄腐酸,除去不溶物及腐殖酸,用七水硫酸锌和五水硫酸铜作为混合沉淀剂沉淀黄腐酸,离心分离沉淀后,用重铬酸钾-硫酸溶液氧化沉淀中的有机碳,剩余的重铬酸钾用硫酸亚铁标准溶液滴定,根据试样氧化前后氧化剂的消耗量计算有机碳量,再经碳系数换算得到产品中黄腐酸含量。与传统测定方法相比,本法能实现矿物源黄腐酸与生化黄腐酸的区分,并可避免多糖、氨基酸等对测定的干扰,保证了检验结果的准确性。A method for determining the content of mineral fulvic acid in macroelement water soluble fertilizer is proposed. Extract mineral fulvic acid with sulfuric acid solution with pH about 1, remove insoluble matter and humic acid, precipitate fulvic acid with zinc sulfate heptahydrate and copper sulfate pentahydrate as mixed precipitant, after centrifugation and precipitation, oxidize the organic carbon in the precipitation with potassium dichromate sulfuric acid solution, titrate the remaining potassium dichromate with ferrous sulfate standard solution, and calculate the amount of organic carbon according to the consumption of oxidant before and after oxidation of the sample. Then, the content of fulvic acid in the product is obtained by carbon coefficient conversion. Compared with the traditional determination method, this method can distinguish mineral fulvic acid from bio-fulvic acid, avoid the interference of polysaccharides and amino acids, and ensure the accuracy of the test results.

关 键 词：大量元素 水溶肥料 矿物源黄腐酸 生化黄腐酸 检测方法 

分 类 号：S141[农业科学—肥料学]