Comparison of DMA-80 and ICP-MS Combined with Closed-Vessel Microwave Digestion for the Determination of Mercury in Coal

Table 4

Calibration curves and method detection limit (MDL) of Hg.

Methods	Linearity (ug/L)	Determination coefficient	MDL (ug/L)	RSD (%)
50 mg sample (HNO3 + HF)	0–100	0.999969	1.220	0.34
50 mg sample (HNO3+HF + Au)	0–100	0.999926	1.107	0.29
50 mg sample (HNO3+HF + Au (after))	0–100	0.999929	0.310	0.94
100 mg sample (HNO3+HF + HCl)	0–100	0.999929	1.000	0.10