Determination of copper, zinc and cadmium by cloud point extraction-flame atomic absorption spectrometry in red wine

Copper, zinc and cadmium are nutritionally essential metals and are widely distributed in nature. These metals play an important role in human metabolism, and are an essential micronutrient required for good health. However, high levels of these elements can be harmful, which can lead to biological disorder. Due to these reasons, the accurate and precise determinations of trace metals of red wine are important. PAN volume, pH, Triton X-114 volume, the centrifugal time, the silent time, the buffer solution were optimized in the cloud point extraction. Appropriate measurement parameteres were established by flame atomic absorption spectrometry of detecting copper, zinc and cadmium.The cloud point extraction optimum condition: pH 7.0, PAN volume 0.5 mL, Triton X-114 volume 0.5 mL, the centrifugal time 5 min, the silent time 25 min after adding the PAN, the buffer solution volume 1.0 mL. Copper, zinc and cadmium detection of red wine by the flame atomic absorption spectrometr: the slit width 0.7 H, the air acetylene ratio 2.0:17.0, the observed altitude 0.01 mm. The limit of detection, relative standard deviation and the recovery rate of the proposed method were(0.02 ± 0.001) μg/mL, 6.7, 95.50%-104.00%, respectively. This method was efficient, sensitive and suitable for large scale determination. © 2016, Editorial Office of Journal of CIFST. All right reserved.