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A surfactant-sensitized spectrophotometric method for determination of trace orthophosphate has been developed using anion surfactant (Ultrawet 60L) with molybdate and malachite green in low acidic medium (pH T 1.0). The method detection limit (3×standard deviation of blank, n=10) was 8nM and the calibration curve was linear over a range of 10–400nM (r 2 =0.997). The molar absorptivity...
A long liquid waveguide capillary flow cell has been successfully adapted to a gas-segmented continuous flow auto-analyzer for trace analysis of iron in water. The flow cell was made of new material, Teflon AF-2400, which has a refractive index (1.29) lower than water (1.33). Total reflection of light can be achieved, provided that the incident angle at each reflection on the water/Teflon interface...
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