[Determination of lead in urine by differential potentiometric stripping analysis].
In the determination of lead in urine by differential potentiometric stripping analysis (DPSA) urine samples are acidified with hydrochloric acid to a total concentration equal to 0.2 mol/L without prior digestion with mineral acids. The sample is pre-electrolyzed at -1.2V (Vs SCE) for 80 seconds by glassy-carbon electrode coated with mercury. The lead concentrations are evaluated by means of standard addition. Detection limit of the method is 2ppb. The linear relationship occurs in the range of 0-150ppb. The relative standard deviations are 1.6% and the recovery of lead in urine samples is 89.5-110.0%. Compared with dithizone method, this method shows no significant difference in the results obtained.
Sun
X X
XX
Zhang
M Y
MY
Guo
S J
SJ
D006801:Humans; D007854:Lead / Q000652:urine*; D011199:Potentiometry / Q000379:methods
D007854:Lead