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用间接法测定了硝基腐植酸钙中络合钙的含量。该法操作简单，测定结果准确。该法的变异系数为０５２％，回收率为９９９７％
The content of complexation calcium in nitro humic acid calcium was determined by indirect method. The method is simple, accurate measurement results. The coefficient of variation of this method is 052%, the recovery rate is 9997%