The results of colorimetric determination in natural water are equal to 81% of TOC analyzer. The trend of DOC by colorimetric determination is similar to that of TOC analyzer in soil extractant.

• 天然水体中水溶性有机碳比色法测定结果相当于TOC仪测定结果的81%25,而土壤溶液中有机碳比色结果的趋势与TOC仪测定结果趋势一致。