Hw. Chen et al., THE INFLUENCE OF CHELATING REAGENTS ON PLUMBANE GENERATION - DETERMINATION OF LEAD IN THE PRESENCE OF PAN-S, Talanta, 40(8), 1993, pp. 1147-1155
A series of 22 chelating reagents were tested for plumbane generation.
Besides nitroso R salt, the reagents Bromo Pyrogallol Red, Pyrocatech
ol Violet, Alizarine Red-S, 5-Br-PADAP and PAN-S could significantly e
nhance the lead signal. The PAN-S system has been optimized. The chara
cteristic concentration (5 ml sample) is 1.3 ng/ml, and the RSD at the
50 ng/ml level is 3.9%. Lead spiked into tap water and natural water
was determined by HG-AAS in the presence of PAN-S. Recoveries of spike
d lead were between 90 and 105%. Study of the mechanism suggests that
the lead hydride might be directly generated from the chelated Pb(II)
instead of the metastable Pb(IV).