自动电位滴定仪测定锰矿石中全锰量

Determination of total manganese in manganese ore by automatic potentiometric titrator

样品经盐酸、磷酸、硝酸、高氯酸加热溶解后,以硫酸亚铁铵为标准溶液为滴定液,采用自动电位滴定仪测定全锰量。经过对5个有证标准样品进行测试,全锰量测定的平均值与认定值的误差在0.015%～0.145%之间,标准差为0.074%,t检验值为0.366。选取主要进口国含量不同的样品进行全锰量的测定,并进行方法对比,其允许差符合标准GB/T 1506-2002规定。本法具有较高灵敏度和准确度,可用于大批量锰矿石的日常检测。

The sample was dissolved in hydrochloric acid,phosphoric acid,nitric acid and perchloric acid by heating.The content of total manganese was determined by automatic potentiometric titrator.Five certified reference materials were tested.The errors between average determination value and certified value of total manganese content were in the range of 0.015 %-0.145%.The standard deviation was 0.074% and the t test value was 0.366.Various samples with difference total manganese contents from main import countries were selected for the determination of total manganese.The method comparison was conducted,and the admissible error complied with rules in GB/T 1506-2002.This method had high sensitivity and accuracy,and it could be used for the routing inspection of large numbers of manganese ores.