Wanchai Tanglearkpipat. Application of 1,10-Phenanthroline and Eosin reaction for dissolved lead analysis . Master's Degree(Appropriate Technology for Resources and Environmental Development). Mahidol University. : Mahidol University, 2005.
Application of 1,10-Phenanthroline and Eosin reaction for dissolved lead analysis
Abstract:
The aim of this work was to apply 1,10 phenanthroline and eosin for trace lead
analysis. Optimum condition on lead absorption including pH, reagent concentration,
lead concentration and reaction time were determined using UV Spectrophotometer.
In addition, influences of metal ions i.e. Arsenic, Cadmium, Chromium, Nickel, Zinc
and Copper, on reactions were also observed. All data were statistically analysed by
ANOVA and Duncan’s multiple range Test at 95 % confidence interval.
The results from this work clearly demonstrated that this method could be used
for trace lead determination. Suitable reaction conditions occurred through 1,10
phenanthroline and eosin solutions with lead at the pH level of 4.5, with the optimum
concentration of 1,10-Phenanthroline and Eosin at 2.5×10-3 M. Also, this method is
applicable to the sample with lead at the minimum concentration of 0.1 ppm, without
effect from any metal interferences. Even though, it has been found that As, Cr 0.2
ppm., Cd, Cu, Zn 0.05 ppm and Ni 0.03 ppm did not effect this experiment, but
some foreign ions tended to behave as interference after a longer measuring time.
Therefore, the sample measurement should be promptly done after the reagents are
added in order to prevent interference.