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当前位置: 首页 > 文章 > 不同土壤有机碳测定方法的比较 土壤 2018 (3) 552-557
Position: Home > Articles > Method Comparison for Determining Soil Organic Carbon Soils 2018 (3) 552-557

不同土壤有机碳测定方法的比较

作  者：
唐伟祥;孟凡乔;张煜;赵自超
关键词：
土壤;沉积物;有机碳;酸洗;湿氧化法;间接法
摘  要：
对土壤碳的准确定量是研究土壤肥力和农业固碳的前提。本文选择我国不同有机碳和无机碳含量的8个代表性土壤/沉积物样品,比较湿氧化法、酸洗法和间接法三类方法对有机碳含量的测定效果。研究结果表明:对有机碳含量为3.4~11.5 g/kg的土壤和沉积物样品,湿氧化法有较低的平均相对误差(0.32%~4.72%)和变异系数(0.40%~1.22%),间接法的平均相对误差(5.16%~20.46%)和变异系数(0.60%~7.00%)都较高,而酸洗法介于这两个方法之间。说明在保持稳定准确的加热温度情况下,湿氧化法对土壤/沉积物有机碳含量的测定比较稳定和准确,且操作简单。对大部分样品,由于酸对土壤无机碳难以充分溶解,造成酸洗法和间接法的有机碳测定值偏高,且变异系数较大。
译  名：
Method Comparison for Determining Soil Organic Carbon
作  者：
TANG Weixiang;MENG Fanqiao;ZHANG Yu;ZHAO Zichao;College of Resources and Environmental Sciences, China Agricultural University;
单  位：
TANG Weixiang%MENG Fanqiao%ZHANG Yu%ZHAO Zichao%College of Resources and Environmental Sciences, China Agricultural University
关键词：
Soil;;Sediment;;Organic carbon;;Acid washing;;Wet oxidation;;Indirect method
摘  要：
Precise quantification of soil carbon is the prerequisite for the study of soil fertility and carbon sequestration in agriculture. This study selected eight representative soil/sediment samples with different contents of organic carbon(OC) and inorganic carbon(IC), and compared the accuracies of three analytical methods, i.e., wet oxidation method, dry combustion method with acid washing, and indirect method. The results showed that, for soil and sediment samples with OC contents of 3.4–11.5 g/kg, wet oxidation method had the lowest mean relative error(0.32%–4.72%) and the lowest coefficient of variation(0.40%–1.22%), while the indirect method had the highest mean relative error(5.16%–20.46%) and the highest coefficient of variation(0.60%–7.00%). These results indicated that if a stable and accurate heating temperature was maintained, the measured results of wet oxidation method, the simplest method, are stable and accurate. Due to a difficult dissolution of inorganic carbon in the dry combustion with acid washing, or difficult total combustion of inorganic carbon in the indirect method, these two methods had a positive error of organic carbon and the coefficient of variation was also higher for most samples.

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