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- W3022153911 endingPage "104978" @default.
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- W3022153911 abstract "Herein we describe the development of an automatic liquid–liquid extraction procedure for the photometric determination of Hg(II) in soil and sediment extracts. The experimental set-up comprised a multi-commuted flow system module and homemade photometer, which used a light-emitting diode as the radiation source. The photometric method relies on the reaction of diphenylthiocarbazone (dithizone) with Hg(II) ions in alkaline medium. The obtained compound was extracted with chloroform and detected at 488 nm. In addition, the parameters that could affect the complex formation and extraction efficiency, such as, the acidity, reagent concentration, time for reaction development and extraction, and volume of extracting solvent, were studied. Under optimal conditions, a linear response that ranged from 0.25 to 10.0 μg L−1 (r2 = 0.9926) was achieved. The accuracy of the method was assessed using the sample spiking and recovery methodology. According to the results, recoveries between 90% and 116% were achieved for both the soil and sediment samples, which were appropriate for these types of samples. In addition, the samples were analyzed via cold vapor atomic absorption spectrometry. The paired t-test with nine degrees of freedom revealed that no significant differences existed between the results. Other figures of merit, namely the limit of detection of 0.018 μg L−1, coefficient of variation of 0.32% (n = 10), sampling throughput of 22 determinations per hour, dithizone, and chloroform consumptions of 0.13 µg and 0.55 mL, respectively, per determination, were achieved." @default.
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- W3022153911 date "2020-07-01" @default.
- W3022153911 modified "2023-10-17" @default.
- W3022153911 title "Automated liquid–liquid extraction procedure for the photometric determination of nanogram levels of Hg(II) in soil and sediment extracts" @default.
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- W3022153911 doi "https://doi.org/10.1016/j.microc.2020.104978" @default.
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