腐殖酸水溶肥料中钾含量测定方法  

Discussion on the determination method of potassium content in humic acid water-soluble fertilizers

作　　者：蔡玮 娄烽 CAI Wei;LOU Feng(Zhejiang Provincial Farmland Quality and Fertilizer Management Station,Quality Inspection and Testing Center of the Ministry of Agriculture and Rural Affairs,Hangzhou 310020,Zhejiang)

机构地区：[1]浙江省耕地质量与肥料管理总站农业农村部质量监督检验测试中心,浙江杭州310020

出　　处：《浙江农业科学》2025年第1期224-227,共4页Journal of Zhejiang Agricultural Sciences

摘　　要：目前,含腐殖酸的水溶肥中钾含量的测定采用标准NY/T 1977—2010的四苯硼酸钾质量法,此方法全程手工操作,步骤相对繁琐,检测效率偏低。现将固体样品加热煮沸30 min改为超声6~8 min,将沉淀抽滤法与火焰分光光度计测定法和电感耦合等离子光谱仪法作比较,得出火焰光度计法在氧化钾含量≤9.5%时,结果与沉淀法一致,当氧化钾含量>9.5%时,结果偏高。新方法的优势是可批量进行,准确率高,极大地提高了检测效率。感应耦合等离子体(ICP)法测定结果与沉淀法和火焰分光光度计法都存在显著差异,为正偏差,因此,用ICP法测腐殖酸水溶肥料中的钾含量不合适。At present,the standard for determining potassium content in water-soluble fertilizers containing humic acid is the NY/T 1977-2010 potassium tetraphenylborate gravimetric method.This method is operated manually,the steps are relatively cumbersome,and the detection efficiency is low.Solid samples were ultrasonically treated for 6-8 min in motified method,while samples were boiled and heated for 30 min in the original method.Precipitation filtration method was compared with the flame spectrophotometer method and the inductively coupled plasma spectrometer method.It was concluded that the results of the flame photometer method were consistent with those of the precipitation method when the potassium oxide content was≤9.5%,and the results were higher when the potassium oxide content was>9.5%.The advantage of the new method was that it could be performed in batches,with high accuracy,which greatly improved the detection efficiency.The results of inductively coupled plasma(ICP)method were significantly different from those of precipitation method and flame spectrophotometer,which were positive deviations,so it was not appropriate to measure the potassium content of humic acid water-soluble fertilizers by ICP method.

关 键 词：腐殖酸 水溶肥料 钾含量 ICP光谱仪 火焰光度计 

分 类 号：S143[农业科学—肥料学]