Trace Level Arsenic Quantification through Cloud Point Extraction: Application to Biological and Environmental Samples

Table 3

Determination of arsenic from commercially procured chemicals.

Sample	Certified arsenic content (ng)	Arsenic found (ng)
		Proposed method	ICPAES method
(1) Cupric sulphate^a (Analar grade)	5000	4990±24	4990±12
(2) Cupric nitrate^b (Analar grade)	1000	990.0±9	1140±18
(3) Sodium hypophosphite Hydrated^c	4000	4001±16	3800±10
(4) Amaranth dye^d	3000	2900±12	3000±15

𝑛=5; the values given here are average of five measurements.
^aSample was procured from Glaxo Laboratories (India) Ltd., Mumbai with the following certified composition: Cl: 0.003%; As: 0.0005%; Fe: 0.005%; Ni: 0.015%.
^bSample was procured from Glaxo Laboratories(India) Ltd., Mumbai with the following certified composition: Cl: 0.001%; Sulphate: 0.0025%; As: 0.0001%; Fe: 0.005%; Ni: 0.01%; Ba: 0.005%; Pd: 0.001%, Bismuth: 0.001%.
^cSample was procured from SD Fine Chem Ltd., Mumbai with the following certified composition. As: 0.0004%; Pb: 0.001.
^dSample was procured from SD Fine Chem Ltd., Mumbai with the following certified composition. As: 3 ppm; Pb: 10 ppm.