Direct Quantitative Analysis of Arsenic in Coal Fly Ash

Table 1

Optimization of the furnace program for the analysis of coal fly ash (solid sampling system).

Integration time (s)	Ashing temperature(s)	Rate; (°C s^−1)	Hold time (s)	Ar gas; (L min^−1)	Atomizer temperature; (°C)	Rate; (°C s^−1)	Hold time; (s)	Ar gas; (L min^−1)	Correlation; coefficients
10	600	100	20	Max	2100	1000	5	Mid	0.2548
	1200	100	20	Max
10	600	100	20	Max	2100	1000	5	Mid	0.3879
	1200	100	20	Max
	500	100	20	Min
10	1200	100	20	Mid	2000	500	7	Mid	0.5097
	450	100	50	Max
	500	100	20	Min
7.5	1200	100	20	Mid	2000	500	7	Mid	0.6584
	450	100	50	Max
	500	100	20	Min
6	1200	100	20	Mid	2100	500	7	Mid	0.6641
	450	100	50	Max
	600	100	20	Max
5.5	1200	100	20	Mid	2150	500	7	Mid	0.7611
	500	100	50	Max
	600	100	20	Max
6	1200	100	20	Mid	2150	500	7	Mid	0.7739
	500	100	50	Max
	600	100	20	Max
6	1200	100	20	Mid	2150	500	7	Mid	0.9349
	500	100	50	Max

Min: 0.1 L min⁻¹, Mid: 1.0 L min⁻¹, Max: 2.0 L min⁻¹.