5E-S3100A库仑测硫仪称量质量范围的研究

A study on the range of weighed coal sample mass for determination of total sulphur content using the 5E-S3100A sulphur meter

为了解决采用5E-S3100A库仑测硫仪测定煤中全硫含量过程中,在对仪器校正时全硫参考标准值不能覆盖待测样品全硫含量的问题,采用该测硫仪测定编号为GBW11126b和GBW11113f的煤标准物质在一定称量质量范围内的全硫含量,并统计分析其相关性,判断与确定其有效测定范围。研究结果表明:编号为GBW11126b和GBW11113f的煤标准物质的称量质量与其全硫含量并非全部相关,二者的有效称量质量范围不同;试验过程中不可随意更改样品的称量质量,校正仪器时必须满足称量质量与全硫含量不相关的条件,并可采用改变称量质量的多点标定方法标定曲线。

The trouble with the measurement of total sulphur of coal using 5E-S3100 A is that in meter calibration,the total sulphur reference standard values are found not to have a coverage over the values of total sulphur of coal samples under measurement. Therefore,experiments are conducted on measurement of the total sulphur of 2 standard coal samples GBW 111266 and GBW 11113 f within a certain range of weighed mass using Coulomb sulphur meter. Then statistical analysis is made of the correlativity between total sulphur measurements and the range of weighed mass for determination of the meter＇s effective range of measurement. Test result shows that： the weighed masses of the two above-mentioned 2 samples and the measured total sulphur values are not all in close correlation,and they are different in effective range of weighed mass; the weighed mass of the sample should not be changed arbitrarily at the time when measurement is being made; and make sure that meter calibration is made always under the condition that weighed mass of sample is not correlated with measured total sulphur value,and the multi-point calibration curve obtained through changing the weighed mass can be used for meter calibration.