A simple analytical method was established for the simultaneous multielement determination of As, Se and Sb in river water with GF-AAS using TiO2-slurry sampling. Titanium dioxide (TiO2, <0.5 μm) was applied as a sorbent to separate and concentrate these elements in a sample solution (100 -300 ml); after filtration, a slurry was prepared with the solid phase and 5.0 ml of ultrapure water. In order to apply to river-water samples, the effect of TiO2 in atomization, the effect of organic species of their metal and the interference of foreign ions were investigated. The proposed method was applied to JSAC 0302 and river water.
A simple and rapid method for the determination of trace lead in suspended particulate matter in air has been investigated. The sample is collected on a cellulose nitrate filter (diameter: 44 mm, pore size: 0.65 µm) with a low-volume air sampler (flow rate: 151/min). For direct determination, a small disc (diameter: 2.0 mm) is cut from the filter with a paper punch, and it is introduced into a tungsten furnace. Then, 1.0 µg of palladium (palladium chloride solution) as a matrix modifier which accomplishes available atomization of lead is added to the disc. The optimal thermal programs are as follows: drying at 300°C for 30 s, ashing at 1000°C for 30 s, and atomization at 2000°C for 2 s in a mixed gas atmosphere (flow rate: hydrogen 1.01/min, argon 4.01/min). The 283.3 nm line was used for lead on the peak-area method under deuterium lamp-background correction. The relative standard deviation was 14.3% for 7 times determination on 0.035 µg/m3 lead in a suspended particulate matter.
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