Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Hydrochloric 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
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ABSTRACT This monograph for Hydrochloric Acid, Ultratrace provides, in addition to common physical constants, a general description including typical appearance and applications. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Sulfate, Mercury, Selenium, and Trace Metals.
HCl
Formula Wt 36.46
CAS No. 7647-01-0
Suitable for use in ultratrace elemental analysis. Note: The reagent must be packaged in a preleached Teflon bottle and used in a clean laboratory environment to maintain purity.
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . clear, fuming liquid Applications . . . . . . . . . . . . . . . . . . . . . . . . trace metal analysis
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–38% Maximum Allowable Sulfate . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ppm Mercury (Hg) . . . . . . . . . . . . . . . . . . . . . . . 1 ppb Selenium (Se) . . . . . . . . . . . . . . . . . . . . . . . 10 ppb Aluminum (Al) . . . . . . . . . . . . . . . . . . . . . . 1 ppb Barium (Ba) . . . . . . . . . . . . . . . . . . . . . . . . 1 ppb Boron (B) . . . . . . . . . . . . . . . . . . . . . . . . . 5 ppb Cadmium (Cd) . . . . . . . . . . . . . . . . . . . . . . 1 ppb Calcium (Ca) . . . . . . . . . . . . . . . . . . . . . . . 1 ppb
© 2017 American Chemical Society
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ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4164 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
Downloaded by CORNELL UNIV on May 27, 2017 | http://pubs.acs.org Publication Date (Web): February 28, 2017 | doi: 10.1021/acsreagents.4164
pubs.acs.org/doi/book/10.1021/acsreagents
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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TESTS Assay (By acid–base titrimetry). The assay of hydrochloric acid used for ultratrace metal analysis may vary from 20% to 38%, depending on the method of purification. Tare a glass-stoppered flask containing about 30 mL of water. Quickly add about 3 mL of the sample, stopper, and weigh accurately. Dilute to about 50 mL, add 0.15 mL of methyl orange indicator solution, and titrate with 1 N sodium hydroxide volumetric solution. One milliliter of 1 N sodium hydroxide corresponds to 0.03646 g of HCl.
Sulfate See test for hydrochloric acid, [Part 4: Hydrochloric Acid].
Mercury (By CVAAS, [Part 2: Trace and Ultratrace Elemental Analysis; Mercury Determination by CVAAS]). To each of three 100 mL volumetric flasks containing about 35 mL of water, add 20.0 g of sample. To the second and third flasks, add mercury ion (Hg) standards of 10 ng (0.5 ppb) and 20 ng (1.0 ppb), respectively. Add 5 mL of nitric acid to all three flasks, and dilute to the mark with water. Mix. Zero the instrument with the blank, and determine the mercury content using a suitable mercury analyzer system (1.0 mL of 0.01 µ/mL Hg = 10 ng).
Selenium (By HGAAS, [Part 2: Trace and Ultratrace Elemental Analysis; Selenium Determination by HGAAS; Analysis; Procedure for Selenium Determination by HGAAS]). To a set of three 100 mL volumetric flasks, transfer 50.0 g (42 mL) of sample. To two
© 2017 American Chemical Society
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ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4164 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
flasks, add selenium ion (Se) standards of 0.50 µg (10 ppb) and 0.10 µg (20 ppb), respectively. Dilute each to 100 mL with (1:1) hydrochloric acid. Mix. Prepare fresh working standard before use.
Trace Metals
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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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ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4164 ACS Reagent Chemicals, Part 4
