Development of a New Sequential Extraction Procedure of Nickel Species on Workplace Airborne Particulate Matter: Assessing the Occupational Exposure to Carcinogenic Metal Species

Table 4

Results of dissolution of different nickel fractions (N°=3).

Nickel Species	Solution	Treatment	Aspect	Ni expected(mg)	Ni determined(mg)	% extracted
NiSO4	ammonium citrate (Sol A)	10mL, 37°C, 60min	clear	1.6	1.70±0.1	102%
	H2O2 citrate: ammonium citrate (Sol B)	10mL, ΔT, 60min	clear	2.3	2.1±0.2	91%
	solution methanol:Bromine (solution C)	10mL, ΔT, 2h	clear	1.8	1.6±0.1	89%
	Solution HCl: HNO3 1:1 (Sol D)	4mL, 70°C, 30min	clear	2.6	2.7±0.3	103%
Ni3S2	ammonium citrate (Sol A)	10mL, 37°C, 60min	residue	10.8	0.31±0.1	0.03%
	H2O2 citrate: ammonium citrate (Sol B)	10mL, ΔT, 60min	clear	7.6	7.4±1.1	96%
	solution methanol: Bromine (solution C)	10mL, ΔT, 2h	clear	8.0	8.3±0.8	103%
	Solution HCl: HNO3 1:1 (Sol D)	4mL, 70°C, 30min	clear	7.4	8.8±1.2	118%
Ni (0) metallic	ammonium citrate (Sol A)	10mL, 37°C, 60min	residue	4.6	/	/
	H2O2 citrate: ammonium citrate (Sol B)	10mL, ΔT, 60min	residue	12.2	0.5±0.1	4%
	solution methanol: Bromine (solution C)	10mL, ΔT, 2h	clear	8.7	9.2±1.1	105%
	Solution HCl: HNO3 1:1 (Sol D)	4mL, 70°C, 30min	clear	13.4	15.7±2.3	117%
NiO	ammonium citrate (Sol A)	10mL, 37°C, 60min	residue	7.0	/	/
	H2O2 citrate: ammonium citrate (Sol B)	10mL, ΔT, 60min	residue	13.4	0.1±0.1	1%
	solution methanol: Bromine (solution C)	10mL, ΔT, 2h	residue	7.4	/	/
	Solution HCl: HNO3 1:1 (Sol D)	4mL, 70°C, 30min	clear	10.4	11.8±3.2	114%