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- W2043670340 abstract "Aluminium solubility and toxicity increase with acidification. There is no standardized analytical method for the determination of inorganic monomeric Al (Alim), which is the form that causes toxicity to fish. Separation by cation exchange is commonly combined with other analytical methods, such as complexation with pyrochatechol violet (PCV) or 8-hydroxyquinoline (HQ) and total quantification using graphite furnace or inductively-coupled plasma emission. Data from 14 laboratories were obtained for a dilution series of Alim samples; the results of the Alim analysis were statistically evaluated. The Alim levels were altered through pH, which was controlled by the addition of calcium hydroxide. Confounding parameters such as total organic carbon (TOC) or fluoride (F) were controlled. The total determination and HQ methods yielded significantly higher Alim concentrations than the PCV method. Pretreatment by passage through a 0.45 µm filter and pH-adjustment of the ion exchange column had no apparent effect on the Alim yield. However, ultra filtration (<10 kDa) caused a significant reduction in the Alim concentration using the HQ method. The ultra filtrated Alim fraction was similar to the PCV results in the interlaboratory comparison. Retention of colloidal bound Al in the cation exchange column may result in overestimation of Alim when the total and HQ methods are used. Estimated Alim concentrations derived from two equilibrium models were similar to PCV-derived Alim concentrations, as well as the HQ method using ultra filtrated water. The fact that the PCV method does not detect colloidal Al, neither before nor after ion exchange, makes this a preferred technique for Alim analysis. Because of the variability in the reported Alim concentrations that can arise when different analytical procedures are used, the adoption of a single, reliable technique will facilitate inter-study comparisons and provide consistency in the detection of trends in environmental monitoring programs." @default.
- W2043670340 created "2016-06-24" @default.
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- W2043670340 date "2009-01-01" @default.
- W2043670340 modified "2023-09-23" @default.
- W2043670340 title "Which aluminium fractionation method will give true inorganic monomeric Al results in fresh waters (not including colloidal Al)?" @default.
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- W2043670340 doi "https://doi.org/10.1039/b902846c" @default.
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