Differential pulse polarography method

The peak for UA appeared at about –0.15 V in this medium, which responded well to standard additions and high reproducibility was obtained. The validity of the proposed method was tested in serum samples by spiking known concentrations of UA to serum samples and high recovery was obtained. The interference effect of dopamine (DA) and ascorbic acid (AA) was eliminated simply by the addition of Fe(III), in a very fast and quantitative reaction.

11p langthannam 29-12-2021 13 0   Download

The procedure is simple: to a known amount of sulfite in the polarographic cell (HAc, pH 6 or 7) is added an unknown Hg(II) sample. The Hg(II) concentration is calculated simply from the decrease in the sulfite peak after reaction with Hg(II). The limit of detection was 1 × 10 −6 M (S/N = 3) in this medium, which could not be obtained with most other mercury determination methods. The proposed new method exhibits high selectivity, sensitivity, reproducibility, and accuracy.

9p langthannam 29-12-2021 9 0   Download

The electrolyte solutions, sweep rates, purges time, etc...were researched on the determination of cyanide. Distillation time of 90 minutes was recommended to use; some interferences of other anions including sulphide and sulphite were also investigated. Cyanide content ion of cassava and bamboo shoot has been determined by differential pulse polarography method using the quantitative technique of standard addition. The ranges of cyanide concentration in bamboo shoot were within 0.00045 -0.075 mg/g and from limit of detection to 1.7902 mg/g for cassava.

5p khidoichuoi 04-03-2020 27 0   Download