|Table 3: Precision and accuracy in the analysis of QC samples and ECD in ECD Kit.|
|(1)Standard curves of coal. |
(2)Content percentage of sulfur in coal standard: 3.07% (w/w); data are expressed as average ± SD (%R.S.D.), .
(3)Purity of ECD: 97.53%; compositions of ECD QC samples (QC-L, QC-M, and QC-H) were shown in Table 2.