Total Precipitation Separation Enrichment - Flame Atomic Absorption Spectrometry Determination Of Heavy Metal Ions In The Water Environment

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.