有机肥料中水溶性碳的测定方法.pdfVIP

第 卷第 期 中国测试技术 33 4 Vol.33 No.4 年 月 2007 7 CHINAMEASUREMENTTECHNOLOGY July.2007 有机肥料中水溶性碳的测定方法 范 芳 (江西省农业科学院绿色食品环境检测中心,江西 南昌 ) 330200 摘 要:论述了有机肥料中水溶性碳的测定方法,样品先经去离子水振荡浸提过滤处理,浸提液中的水溶性碳在加 热条件下,用过量的重铬酸酸钾 硫酸溶液氧化水溶性有机碳,多余的重铬酸钾用硫酸亚铁标准溶液滴定,由消耗的 - 重铬酸钾量按氧化校正系数计算出有机碳量。结果表明,此法回收率达96.1%~97.7%,变异系数为5.95%～7.4%。该方 法操作简便,结果令人满意。 关键词:有机肥;水溶性碳;方法 中图分类号: 文献标识码: 文章编号: ( ) TQ440.72 A 1672-4984200704-0063-02 Methodofdetectingwater-solublecarboninorganicfertilizer FANFang ( , , , ) MonitoringCenterofGreenFoodEnvironmentJiangxiAcademyofAgriculturalSciencesNanchang330200China Abstract:Thispaperintroducedamethodofdetectingthewater-solublecarboninorganicfertilizer.Theprocess : wasasfollowsthesamplewasdippedinthedeionizedwaterandvibrating,filtrating,thenthefiltratedsolutionleft, inwhichthewater-solublecarbonwasoxidedbyexcessivecompoundsolutionofpotassiumbichromateandHSO 2 4 undertheconditionofheating.Subsequently,theredundantpotassium bichromatewastitratedbythestandard ferroussulfatesolution,andthecontentoforganiccarbonwascalculatedbytheoxidecalibrationcoefficientand theamountofreactivepotassiumbichromate.Theresultindicatedthatthereturn-ratioreached96.1%～97.7% and thecoefficientofvarationwaslessthan5.95%～7.4% throughthismethod.Inaddition,themethodissimplein operationprocessandtheresultissatisfying. ;