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Flame atomic absorption spectrometry determination of calcium and zinc in cucumber


completedigestionmethod. .) La juice wasusedascalciumreleasingagenttOeliminatechemicalinterfer-ence. Theresultsindicatethataddingsuitableamountofhydrochloricacidinsuspensionsolutioncanin-creasetheabsorbanceoftestedelementmarkedly. Thephysicalpropertiesoftestsolutionisidenticalwithblanksolutionandthereisnobackgroundabsorptioninterference. TheRSDswerelessthan0.9%. TheresultsofthismethodwereconsistentwithashingmethodandtherelativeerroretweenthetWOmethodswerelessthan ± 0.7%. InFAAS, displacementofashingmethodbysuspensionsolutionandnoncompletedigestionmethodsiSpossible. Microemulsion dual wavelength spectrophotometric simultaneous determination of cobalt and nickel packages Li Zhu Xia Shi Guorong (Institute of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou,[link widoczny dla zalogowanych], 225002) summarizes in a microemulsion system, using dual-wavelength spectrophotometric determination of metal ions in a 8-hydroxy quinoline (HQ) complex. The results show that, CTAB microemulsion on the metal ion of a system of 8-hydroxy quinoline has a strong sensitizing effect of cobalt in the O ~ 4. O ~ tg / mL, Nickel O ~ 5.0 ~ tg / mL law is obeyed. For cobalt and nickel of similar nature are not separated in the case, the use of Microemulsion dual wavelength spectrophotometry directly with satisfactory results. Key words cobalt-nickel-dual wavelength spectrophotometry Microemulsion dual wavelength spectrophotometry l Introduction The main advantage is that when present in the sample absorption and scattering interferences interferences, can improve the absorption measurement of the selectivity, sensitivity and accuracy , coupled with relatively simple instrumentation, easy operation, making the dual-wavelength spectrophotometry has been used widely. For example,[link widoczny dla zalogowanych], this method simultaneous determination of calcium and magnesium in drinking water [1; 5 a Br-DMPAP-PVA. Simultaneous measurement system of cobalt and nickel in wastewater L2; ARS determination of zirconium [3; industrial production of hydrogen peroxide determination [4J and the determination of hydroxides [5]. Microemulsion is normally provided by surfactants, cosurfactant, oil, water and other components under the appropriate proportion of the composition of the colorless, transparent (or translucent), low viscosity, thermodynamically stable system. Our previous research showed that: the microemulsion with ultra-low interfacial tension and high solubilization capacity, as an associative structure of colloidal microemulsion with spectrophotometric analysis for sensitizing effect [6]. We have a non-ionic microemulsion fluorescence quenching method for determination of trace nickel [1o3, a cationic microemulsion 8-hydroxyquinoline aluminum fluorescence method [1, using non-ionic microemulsion ICP-AES determination of platinum group River mouth element, achieved satisfactory results. However, cationic microemulsion for dual wavelength spectrophotometry has not been reported. Cobalt and nickel of a similar nature, often associated in the sample exists, the previous analysis of cobalt and nickel, often adding a solvent extraction [1 lead, cobalt or nickel in order to eliminate the interference,[link widoczny dla zalogowanych], the steps cumbersome and error prone. This paper introduces the 8-hydroxy quinoline as cobalt and nickel reagent, in the CTAB microemulsion system, the use of dual wavelength spectrophotometry, in the case without extraction, the direct analysis of trace cobalt and nickel,[link widoczny dla zalogowanych], has resulted in satisfactory. 2 Experimental 2.1 Instruments and reagents pHS a 29A pH meter (Shanghai Jing kore magnetic); UV a 2550 UV spectrophotometer (Shimadzu). About the author: Package Li, female,[link widoczny dla zalogowanych], born 1978, MS, Research Interests: spectroscopy. Contact: Zhu nepheline, female, born in 1960, Ph.D., professor, research direction: spectral analysis. E-mail: xszhu @ yzu. edu. cn
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