Method for detecting trace zinc ions by using cloud point extraction and ultraviolet-visible spectrophotometry
A spectrophotometry, zinc ion technology, applied in the measurement of color/spectral characteristics, preparation of test samples, etc., can solve the problems of time-consuming, labor-intensive, environmental pollution, etc. simple effect
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Embodiment 1
[0029] Example 1 Establishment of cloud point extraction-ultraviolet-visible spectrophotometry method for determining trace zinc ions
[0030] 1. Instruments and reagents
[0031] (1) Instruments: pHS-3C digital acidity meter (Shanghai Ohaus Instrument Co., Ltd.), CAV214C electronic balance (Shanghai Ohaus Instrument Co., Ltd.), DL-360E intelligent ultrasonic cleaner (Shanghai Zhixin Instrument Co., Ltd. ), UV2550 ultraviolet-visible spectrophotometer (Shimadzu Corporation), TG6A centrifuge (Shanghai Lu Xiangyi Instrument Co., Ltd.), constant temperature blast drying oven (Shanghai Xinmiao Medical Instrument Manufacturing Co., Ltd.), electric heating constant temperature water bath (Beijing Yong Guangming Medical Instrument Factory).
[0032] (2) Reagent: 1mg·mL -1 Zn 2+ Add a certain amount of 2% (v / v) dilute nitric acid solution to the standard stock solution, Zn 2+ Standard working solution (5 μg mL -1 ) is composed of Zn 2+ Standard stock solution diluted with water....
Embodiment 2
[0072] Example 2 The influence of interfering ions on the method of cloud point extraction-ultraviolet-visible spectrophotometry for the determination of trace zinc ions
[0073] According to the method of embodiment 1, the influence of several common metal ions on the extraction rate of zinc ions has been studied, and the results are shown in table 1. The metal ions in normal water samples, soil samples, and blood samples do not substantially affect the extraction rate of zinc ions. interference.
[0074] Table 1 Effect of interfering ions on cloud point extraction
[0075]
Embodiment 3
[0076] The mensuration of embodiment 3 samples
[0077] According to the method of Example 1, trace amounts of zinc ions in tap water, river water (Xihe), river water (Jialing River), mountain soil, garden soil, farmland soil and rabbit blood samples were determined. The results are shown in Table 2. The recoveries of the samples were in the range of 97.7-101.5%. Therefore, the combination of cloud point extraction and ultraviolet spectrophotometry can be used to determine trace zinc ions in environmental water samples and soil.
[0078] Determination of zinc ion content in the sample of table 2 (n=3)
[0079]
[0080] The present invention uses TritonX-100 and SDS as a mixed surfactant, 1-(2-pyridylazo)-2-naphthol (PAN) as a metal ion complexing agent, and combines cloud point extraction with ultraviolet spectrophotometry to determine trace amounts of Zn 2+ . The effects of different reaction conditions such as pH value, complexing agent dosage, surfactant concentrati...
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