岩矿测试2024，Vol.43Issue(4)：632-640,9.DOI:10.15898/j.ykcs.202404210092
自动滴定仪测定土壤有机碳及其组分的方法优化
Method Optimization for the Determination of Soil Organic Carbon and Its Components by Automatic Titrator
摘要
Abstract
The rapid and accurate detection of soil organic carbon and its components(such as particulate organic carbon and mineral-associated organic carbon)is of great significance because they are the key indicators reflecting soil quality.Compared with manual titration,the automatic titrator has a low work intensity and accurate detection,but its detection efficiency is less than 30％of that of manual titration.To solve this problem,the influence of the addition amount of four oxidants on the determination of organic carbon was explored,and the effect of pre-adding titrant in advance on the improvement of detection efficiency was studied.Finally,the optimal addition amount of oxidant was 2mL,and the amount of the pre-added titrant was one-third of the titration amount of the blank sample.An automatic titrator method for the determination of soil organic carbon was established.This method was verified by using soil samples with different levels of organic carbon and reference substances and was compared with manual titration.The results showed that there was no significant difference between the automatic titrator and the manual titration.The relative standard deviation(RSD,n=6)of the method was 2.10％-12.96％,the recovery rate of standard addition was 93.37％-98.06％,and the relative error of the reference material was 4.31％-4.79％.The titration time of a single sample was shortened from llmin to 3.5min,and the overall detection efficiency was higher than that of manual titration.The reagent consumption was only 40％of that of manual titration.The automatic titrator significantly improved the detection ability of organic carbon.关键词
自动滴定仪/人工滴定/土壤有机碳/氧化剂加入量/预加滴定量Key words
automatic titrator/manual titration/soil organic carbon/the addition amount of oxidants/amount of the pre-added titrant分类
地质学引用本文复制引用
李朝英,郑路,郑之卓,李华,王亚南,明安刚..自动滴定仪测定土壤有机碳及其组分的方法优化[J].岩矿测试,2024,43(4):632-640,9.基金项目
崇左凭祥友谊关森林生态系统广西野外科学观测研究站科研能力建设项目(桂科22-035-130-03) （桂科22-035-130-03）
广西林业科技推广示范项目(桂林科研[2022]第27号,2023GXLK45) （桂林科研[2022]第27号,2023GXLK45）
