土壤有效硼提取及测定方法比较

Comparative Study of Extraction and Determination Methods for Soil Available Boron

本文提出一种沸水浴提取–ICP-OES测定土壤有效硼的方法,并着重比较分析沸水提取–姜黄素比色法、沸水提取–ICP-OES法、沸水浴提取–ICP-OES法和沸水浴提取–姜黄素比色法对土壤有效硼的测定结果。通过讨论4种方法的测定下限、方法检出限和测定精密度及正确度,及对来自不同地区高中低有效硼含量的6种土壤有效态成分标准物质和4种实际土壤样品的测定比较,探讨4种方法分析测定的关键因素、方法相关性。结果表明,沸水浴提取–ICP-OES法操作简单便捷,方法的检测下限低、干扰因素少、重复性好,可适用于各类型批量样品分析及研究。本研究可为实验室开展土壤有效硼测定方法研究提供借鉴,也可为承担“第三次全国土壤普查”土样检测的实验室在土壤有效硼测定的方法选择、效率提升和质量保证上提供技术支撑。

This paper proposed a boiling water batch extraction–ICP-OES method for determining soil available boron(SAB),and compared its determination results with three other methods,i.e.,boiling water extraction–curcumin colorimetric method,boiling water extraction–ICP-OES method,boiling water bath extraction–curcumin colorimetric method.By discussing the detection limits,method detection limits,and determination precision and accuracy of the four above methods,and comparing and analyzing six standard reference materials of high,medium,and low available boron contents from different regions and four actual soil samples,the key factors and method correlations of the four methods were explored.The results showed that the proposed method was simpler and more convenient to operate,with lower detection limits,fewer interference factors,and better repeatability,thus it is suitable for batch sample analysis and determination of various sample types.This comparative study can provide reference for laboratories to carry out research on SAB determination methods,and also can provide technical supports in method selection,efficiency improvement and quality assurance for the testing laboratories which conduct soil sample determination of“The Third National Soil Survey”.