ISO 2762-1973 rus PDF

Full title and description

ISO 2762:1973 — "Hydrochloric acid for industrial use — Determination of soluble sulphates — Turbidimetric method". Specifies a turbidimetric analytical procedure for measuring soluble sulphate content in hydrochloric acid intended for industrial applications.

Abstract

Defines a turbidimetric test in which a test portion of hydrochloric acid is evaporated to dryness, the residue is dissolved in hydrochloric acid, and soluble sulphates are precipitated as barium sulphate under controlled conditions. The turbidity produced is measured and compared with standards; the method is applicable to products containing less than 0.1 % (m/m) soluble sulphates.

General information

• Status: Published (confirmed standard).
• Publication date: 1973-11 (Edition 1, 1973).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.060.30 (Acids).
• Edition / version: 1 (1973).
• Number of pages: 3.

Bibliographic and status details are recorded in the ISO catalogue and national standards distributors.

Scope

Applies to hydrochloric acid supplied for industrial use and specifies a laboratory procedure for the quantitative determination of soluble sulphates at low concentrations (below about 0.1 % m/m). The method is intended for quality control and conformity testing of industrial HCl and gives the analytical principle, required reagents and apparatus, preparation of calibration standards, procedure for precipitation and measurement of turbidity, calculation of results, and considerations for method precision and interferences. National translations or adoptions may be available; the original ISO text is in English (French translation noted where provided).

Key topics and requirements

• Applicability: industrial hydrochloric acid samples with soluble sulphates <0.1 % (m/m).
• Analytical principle: evaporate sample, dissolve residue in HCl, precipitate sulphate as BaSO4, measure turbidity (nephelometric/turbidimetric comparison to standards).
• Reagents: purified barium reagent, acid media, calibration standards for turbidity; emphasis on reagent purity to avoid contamination.
• Apparatus: evaporation vessel, controlled heating, filtration where required, turbidimeter / nephelometer meeting specified performance characteristics.
• Calibration & calculation: prepare a calibration curve or reference turbidity standards; express results as percentage (m/m) of soluble sulphates with stated precision limits.
• Interferences and precautions: control for particulate contamination, insoluble residues, and interfering ions; follow specified conditioning and blank corrections.

These key requirements summarize the method framework and routine quality-control steps described in the standard.

Typical use and users

Used by industrial chemical manufacturers, quality control laboratories, import/export testing facilities, and third‑party testing houses responsible for verifying the purity of hydrochloric acid for industrial applications. Also relevant to procurement and compliance personnel who require a standardized test method for contract and specification compliance.

Related standards

Related ISO documents cover methods for testing industrial chemicals and acids and other analytical procedures for raw materials and acids. Examples of adjacent standards and historical neighbouring entries in the ISO catalogue include other 1970s-era methods for industrial chemical analysis and specific standards for acids and borates; consult national standards bodies or the ISO catalogue for up-to-date cross-references.

Keywords

ISO 2762:1973; hydrochloric acid; HCl; soluble sulphates; sulphate determination; turbidimetric method; barium sulphate precipitation; industrial acid quality control; analytical chemistry; turbidity measurement.

FAQ

Q: What is this standard?

A: ISO 2762:1973 is an International Standard that specifies a turbidimetric laboratory method for determining soluble sulphates in hydrochloric acid intended for industrial use.

Q: What does it cover?

A: It covers the analytical principle (precipitation of sulphates as barium sulphate and turbidity measurement), required reagents and apparatus, the test procedure, calibration and calculation of results, precision considerations, and handling of common interferences for samples with soluble sulphates below about 0.1 % (m/m).

Q: Who typically uses it?

A: Chemical manufacturers, QC laboratories, testing and inspection bodies, and procurement specialists who need a standardized method to verify soluble sulphate content in industrial hydrochloric acid consignments.

Q: Is it current or superseded?

A: The ISO bibliographic record for ISO 2762:1973 shows the original publication (1973) and its confirmation in ISO reviews; users should check the ISO catalogue or national standards body for the latest confirmation or withdrawal status before relying on the text for regulatory compliance. As of the ISO catalogue entry, the 1973 text has been maintained in the ISO records (see ISO catalogue entries).

Q: Is it part of a series?

A: It is one of many ISO standards addressing test methods for industrial chemicals and acids. It is catalogued among other chemical analysis standards from the same era; consult the ISO catalogue for standards covering related substances and test procedures.

Q: What are the key keywords?

A: Hydrochloric acid, HCl, soluble sulphates, sulphate determination, turbidimetric, barium sulphate, industrial acid, ISO 2762:1973.