凯氏蒸馏法测定土壤全氮的改进方法
An Improved Method for Determining Total Nitrogen in Soil by Kjeldahl Distillation
谢航通1
作者信息
- 1. 山西省地球物理化学勘查院有限公司,山西运城 044000
- 折叠
摘要
采用凯氏蒸馏法对4种不同类型的土壤进行全氮测定,通过实验数据以比较不同的还原剂、催化剂和氧化剂对全氮的影响,发现以五水合硫代硫酸钠做还原剂,以K2SO4+CuSO4+TiO2做催化剂和以硫酸为氧化剂,具有操作简便、省时、无污染的优点.该方法对应不同类型土壤的加标回收率为88.9%～93.1%,标样样品测试相对误差为0%,标准偏差为8.1%～16.5%,检出限为14 mg/kg.
Abstract
The Kjeldahl distillation method was used to determine total nitrogen in soil for nine different types of soil.Through experimental data comparison of different reducing agents,catalysts,and oxidants,it was found that using sodium thiosulfate pentahydrate as a reducing agent,K2SO4+CuSO4+TiO2 as a catalyst,and sulfuric acid as an oxidant has the advantages of simple operation,time-saving,and pollution-free.This method corresponds to a recovery rate of 88.9%to 93.1%for different types of soil,a relative error of 0%for standard sample testing,a standard deviation of 8.1%to 16.5%,and a detection limit of 14 mg/kg.
关键词
凯氏法/土壤全氮/不同类型的土壤Key words
Kjeldahl Distillation/soil total nitrogen/different types of soil引用本文复制引用
出版年
2024
NETL
NSTL
万方数据