Determination of lead and manganese in biological samples and sediment using slurry sampling and flame atomic absorption spectrometry.

A procedure was developed for the determination of lead (Pb) and manganese (Mn) using slurry sampling. The two elements were detected using flame atomic absorption spectrometry with a slotted tube atom trap. Slurries were prepared by adding nitric acid solution (0.

Use of constrained mixture design for optimization of method for determination of zinc and manganese in tea leaves employing slurry sampling.

A slurry suspension sampling technique has been developed for manganese and zinc determination in tea leaves by using flame atomic absorption spectrometry. The proportions of liquid-phase of the slurries composed by HCl, HNO(3) and Triton X-100 solutions have been optimized applying a constrained mixture design. The optimized conditions were 200mg of sample ground in a tungsten carbide balls mill (particle size<100 microm), dilution in a liquid-phase composed by 2.