影响TOC有机碳分析仪测定土壤碳含量的因素  

Study on factors affecting determination of soil carbon by total organic carbon analyzer

作　　者：李小涵[1] 李富翠[1] 王朝辉[1] 

机构地区：[1]西北农林科技大学资源环境学院,杨凌712100

出　　处：《分析仪器》2011年第5期8-12,共5页Analytical Instrumentation

基　　金：国家自然科学基金项目(40671107和30871596);973项目(2005CB121101);国家科技支撑项目(2006BAD25B09);西北农林科技大学大型仪器设备新功能开发项目(dysb090202)

摘　　要：土壤碳含量是评价土壤质量的重要指标。本文以日本岛津TOC-SSM-5000A作为测量仪器,研究了土壤粒度粗细、进样量和磷酸浓度对总碳和无机碳测定的影响,为准确测定土壤碳含量提供了理论依据和技术支撑。结果表明,土壤粒径不是越细越好,0.20mm粒径比较合适;进样量越大,测定时间越长,40mg的进样量较为理想;测定土壤无机碳时,采用100%浓磷酸的测定值最高。Soil carbon is one of the most important indexes for soil quality. The effects of soil particle size, sample weight and phosphoric acid concentration on the determination of soil total carbon and inorganic carbon were investigated using TOC-SSM-5000A total organic carbon analyzer as measurement instrument. The results showed that it was not the finer the soil particle size the better, and the suitable size was 0.2mm. Measuring time became longer with the increase of sample weight, and the reasonable sample weight was 40mg per sample. The maximum value of soil inorganic carbon was obtained when the concentration of posphoric acid was 100%.

关 键 词：土壤有机碳 土壤粒度 进样量 磷酸浓度 

分 类 号：S153.61[农业科学—土壤学]