Determination of trace copper in environmental water sample by flame atomic absorption spectrometry with cloud point extraction
Author(s): ZHONG Yi-zhou, WANG Mei, ZHANG Ze-hua, YANG Bing-yi, HUANG Lin-yu, School of Public Health, Guangdong Pharmacy University
Pages: 63-66
Year: 2016 Issue: 1
Journal: Journal of Environment and Health
Keyword: Cloud point extraction; Co-extraction; Flame atomic absorption spectrometry; Environmental water; Copper;
Abstract: Objective To propose a new method for the determination of trace Cu in environmental water by flame atomic absorption spectrometry(FAAS) after the formation of a complex with 5-Br-PADAP and Ca Cl2 in the presence of surfactant Triton X-114. Methods The p H of the solution was adjusted with a suitable buffer to 9.5 for Cu. 5-Br-PADAP(0.4 ml of1 mmol/L), Ca Cl2(0.1 ml of 0.1% W/V) and Triton X-114(0.8 ml of 5% W/V) were consecutively added to the tube. These mixtures were kept for 15 min in a thermostatic bath maintained at 40 ℃, then phase separation was achieved by centrifugation at 3 500 r/min for 10 min, the sample solution was readily evaluated by FAAS. Results In the linear range of 2-240 μg/L, the regression equation of Cu in water was A =0.002 7c +0.024 6,and showed good linear relationship, r =0.999 8. The limit of detection was 0.62 μg/L, the average recovery rates were 96.28%-98.08%,and the RSDs were between 1.67%-3.13%. In a50 ml sample of Cu,concentration factors was 36.58. Conclusion The proposed method is simple, accurate, with satisfactory recoveries, and is applicable to the determination of trace Cu in water.
Pages: 63-66
Year: 2016 Issue: 1
Journal: Journal of Environment and Health
Keyword: Cloud point extraction; Co-extraction; Flame atomic absorption spectrometry; Environmental water; Copper;
Abstract: Objective To propose a new method for the determination of trace Cu in environmental water by flame atomic absorption spectrometry(FAAS) after the formation of a complex with 5-Br-PADAP and Ca Cl2 in the presence of surfactant Triton X-114. Methods The p H of the solution was adjusted with a suitable buffer to 9.5 for Cu. 5-Br-PADAP(0.4 ml of1 mmol/L), Ca Cl2(0.1 ml of 0.1% W/V) and Triton X-114(0.8 ml of 5% W/V) were consecutively added to the tube. These mixtures were kept for 15 min in a thermostatic bath maintained at 40 ℃, then phase separation was achieved by centrifugation at 3 500 r/min for 10 min, the sample solution was readily evaluated by FAAS. Results In the linear range of 2-240 μg/L, the regression equation of Cu in water was A =0.002 7c +0.024 6,and showed good linear relationship, r =0.999 8. The limit of detection was 0.62 μg/L, the average recovery rates were 96.28%-98.08%,and the RSDs were between 1.67%-3.13%. In a50 ml sample of Cu,concentration factors was 36.58. Conclusion The proposed method is simple, accurate, with satisfactory recoveries, and is applicable to the determination of trace Cu in water.
Related Articles