Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Hydrofluoric Acid, Ultratrace Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for Hydrofluoric Acid, Ultratrace provides, in addition to common physical constants, a general description including typical appearance, applications, aqueous solubility, and pKa. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Chloride, Phosphate, Sulfate, Sulfite, Mercury, and Trace Metals.
HF
Formula Wt 20.01
CAS No. 7664-39-3
Suitable for use in ultratrace elemental analysis. Note: Reagent must be packaged in a preleached Teflon bottle and used in a clean laboratory environment to maintain purity.
GENERAL DESCRIPTION Typical appearance Applications . . . . . Aqueous solubility . pKa . . . . . . . . . .
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clear liquid trace metal analysis miscible 3.1
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–51.0% Maximum Allowable Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 0.5 ppm Phosphate (PO4) . . . . . . . . . . . . . . . . . . . . . 1 ppm Sulfate and sulfite (SO4) . . . . . . . . . . . . . . . . 1 ppm Mercury (Hg) . . . . . . . . . . . . . . . . . . . . . . . 1 ppb Aluminum (Al) . . . . . . . . . . . . . . . . . . . . . . 1 ppb Barium (Ba) . . . . . . . . . . . . . . . . . . . . . . . . 1 ppb
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4166 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Boron (B) . . . . . Cadmium (Cd) . . Calcium (Ca) . . . Chromium (Cr) . . Cobalt (Co) . . . . Copper (Cu) . . . . Iron (Fe) . . . . . . Lead (Pb) . . . . . Lithium (Li) . . . . Magnesium (Mg) . Manganese (Mn) . Molybdenum (Mo) Potassium (K) . . . Silicon (Si) . . . . . Sodium (Na) . . . . Strontium (Sr) . . Tin (Sn). . . . . . . Titanium (Ti) . . . Vanadium (V) . . . Zinc (Zn) . . . . . . Zirconium (Zr) . .
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5 1 1 1 1 1 5 1 1 1 1 1 1 5 5 1 1 1 1 1 1
ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb ppb
TESTS Assay (By acid–base titrimetry). Tare a stoppered plastic flask containing about 25 mL of water, and deliver, using a plastic pipette, about 1.5 mL of sample under the water surface. Weigh accurately, wash down the sides, and dilute the solution to 50–60 mL with water. Add 0.15 mL of phenolphthalein indicator solution, and titrate with 1 N sodium hydroxide volumetric solution. One milliliter of 1 N sodium hydroxide corresponds to 0.02001 g of HF.
Chloride See test for hydrofluoric acid, [Part 4: Hydrofluoric Acid]. Use 18 mL of sample, and add it to 45 mL of water.
Phosphate See test for hydrofluoric acid, [Part 4: Hydrofluoric Acid].
Sulfate and Sulfite See test for hydrofluoric acid, [Part 4: Hydrofluoric Acid]. Use 5.0 mL (50.0 g) of sample solution A.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4166 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Mercury (By CVAAS, [Part 2: Trace and Ultratrace Elemental Analysis; Mercury Determination by CVAAS]). To each of three polyethylene 100 mL volumetric containers, add about 30 mL of water and 10.0 g of sample. Cool the samples in an icewater bath for about 15 min. Add slowly, with caution, 10 mL of ammonium hydroxide. Keeping the flasks in the ice-water bath for another 10 min, add 5 mL of nitric acid. Cool to room temperature. To the second and third flasks, add mercury ion (Hg) standards of 10 ng (1.0 ppb) and 20 ng (2.0 ppb), respectively. Dilute to the mark with water, and mix well. Zero the instrument with the blank, and determine the mercury content using a suitable mercury analyzer system (1.0 mL of 0.01 µg/mL Hg = 10 ng).
Trace Metals Determine the aluminum, barium, boron, cadmium, calcium, chromium, cobalt, copper, iron, lead, lithium, magnesium, manganese, molybdenum, potassium, silicon, sodium, strontium, tin, titanium, vanadium, zinc, and zirconium by the ICP–OES Preconcentration method described in [Part 2: Trace and Ultratrace Elemental Analysis; Inductively Coupled Plasma−Optical Emission Spectroscopy (ICP–OES); Preconcentration of Ultratrace-Grade Reagents for Analysis by ICP–OES].
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4166 ACS Reagent Chemicals, Part 4
