A simple and rapid method for the direct determination of cadmium, lead and copper in milk and fermented
milk products by potentiometric stripping analysis (PSA) with oxygen as an oxidant and with
inverse current imposed through the stripping step is described. For the more selective metals determination
a samples pretreatment by the microwave acid extraction was applied. Due to the significant
increase of the modified technique sensitivity, the detection limits of 0.30, 1.7 and 3.8 lg/l were obtained,
for cadmium, lead and copper, respectively. The method accuracy was confirmed by analysing the standard
reference material (SRM 1577b). The contents of cadmium, lead and copper in milk samples were in
the range of 2.13–4.82, 54.3–95.2 and 112.2–124.7 lg/kg, respectively, whereas in the samples of fermented
milk products in the range of 6.30–24.1, 210.1–463.6 and 260.0–320.7 lg/kg, respectively.
A simple and rapid method for the direct determination of cadmium, lead and copper in milk and fermentedmilk products by potentiometric stripping analysis (PSA) with oxygen as an oxidant and withinverse current imposed through the stripping step is described. For the more selective metals determinationa samples pretreatment by the microwave acid extraction was applied. Due to the significantincrease of the modified technique sensitivity, the detection limits of 0.30, 1.7 and 3.8 lg/l were obtained,for cadmium, lead and copper, respectively. The method accuracy was confirmed by analysing the standardreference material (SRM 1577b). The contents of cadmium, lead and copper in milk samples were inthe range of 2.13–4.82, 54.3–95.2 and 112.2–124.7 lg/kg, respectively, whereas in the samples of fermentedmilk products in the range of 6.30–24.1, 210.1–463.6 and 260.0–320.7 lg/kg, respectively.
การแปล กรุณารอสักครู่..
