A stock solution of 1 g L−1 Ge(iv ) was obtained from Merck (Darmstadt, Germany), the working solutions of Ge(iv ) of lower concentrations were prepared by dilution of the stock solution by 5 × 10−3 mol L−1 of HNO3 as required. A standard solution of 1 g L−1 Bi(iii ), chloranilic acid, Triton X-100, sodium dodecyl sulfate (SDS), and cetyltrimethylammonium bromide (CTAB) were purchased from Fluka (Buchs, Switzerland). A working solution of 1 × 10−2 mol L−1 of chloranilic acid was prepared by dissolving 0.0209 g of the reagent in water in a 10 mL volumetric flask. Suprapur CH3COOH and NaOH were obtained from Merck. Humic acid sodium salt (HA) was obtained from Aldrich. Natural organic matter (NOM) and river fulvic acid (FA) were obtained from the Suwannee River and purchased from the International Humic Substances Society. Biosurfactant (rhamnolipids) and Amberlite XAD-7 resin were obtained from Sigma (St. Luis, MO, USA). Amberlite XAD-7 was washed four times with triply distilled water before use and dried at the temperature of 50 °C.
Suprapur ch3cooh
Manufactured by Merck Group
Suprapur CH3COOH is a high-purity acetic acid product manufactured by Merck Group. It is designed for use in analytical and laboratory applications where a consistent and reliable source of acetic acid is required.
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Lab products found in correlation
2 protocols using suprapur ch3cooh
1
Germanium Speciation and Quantification
2
Determination of Vanadium by Spectrophotometry
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A 1-mol L−1 acetate buffer (prepared from Suprapur CH3COOH and NaOH obtained from Merck) was applied as a supporting electrolyte. Cupferron (Merck) was used to prepare a 1 × 10−2-mol L−1 solution acting as a complexing agent for V(V). Working solutions of V(V) were prepared every day by diluting a vanadium standard solution (Merck, 1 g L−1). The certified reference material SPS-WW1 waste water (batch 111) (concentration of V(V) equal to 100.0 ± 0.5 ng mL−1) was obtained from Spectrapur Standards AS (Oslo, Norway) and used to check the practical suitability of the proposed procedure. To check the selectivity of this procedure, working solutions of a number of foreign ions were used; they were prepared by diluting their standard solutions (1 g L−1) to a concentration of 1 × 10−4 mol L−1 with 1 × 10−2 mol L−1 of HNO3. Additionally, the procedure was tested for sensitivity to Triton X-100 (a representative of surfactants obtained from Fluka) and sodium humic acid (HA) (a representative of humic substances obtained from Aldrich).
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