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Coprecipitation - Flame atomic absorption spectrometric determination of heavy metal ions in water environment research

Author: AoWen
Tutor: YaoJunXue
School: Inner Mongolia University
Course: Chemistry
Keywords: coprecipitation separation and enrichment atomic absorption ternary complex heavy metals
CLC: X830
Type: Master's thesis
Year: 2011
Downloads: 142
Quote: 0
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Abstract


In this paper, the co-precipitation of Mn2+-phen-SCN- ternary complex system for cobalt, nickel in the water were studied. Focus on the choice of the carrier ion, co-precipitation agent to join the order, a total amount of precipitant, pH, ions and other factors on the interference effects of co-precipitation to determine the best conditions for co-precipitation.The results show that the Mn2+-phen-SCN- ternary complex system shows a better concentration effect for Co2+、Ni2+. When the concentration of Co2+ is 1mg/L, the measured precision is 1.40%（n=11）, the detection limit is 12.18μg/L （3σ）. The concentration of Co2+in the Taoli Lake is 6.80μg/L measured by standard addition method.When the concentration of Ni2+ is 1mg/L, the measured precision is 1.73%（n=11）, the detection limit is 21.36μg/L （3σ）. The concentration of Ni2+ in the Taoli Lake is 12.32μg/L measured by standard addition method.The Mn2+-phen-SCN" ternary complex co-precipitation systems have good concentration effects for Co2+、Ni2+, basically eliminate the matrix interference. The experimental method has high sensitivity, low detection limits, precision, recovery of trace element analysis to meet the requirements of accuracy, etc. The method provides a new way for the flame atomic absorption spectrophotometry to determinate the trace Co2+、Ni2+ and the other environment significant danger of heavy metal ions in the water, which has a certain value.

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CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Environmental monitoring > General issues
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