ISO 715-1975 rus PDF

Full title and description

ISO 715:1975 — Zinc — Determination of lead content — Polarographic method. (Russian: «Цинк — Определение содержания свинца — Полярографический метод» — перевод заголовка.) Этот документ описывает полярографический аналитический метод для количественного определения содержания свинца в чистых марках цинка.

Abstract

Standard ISO 715:1975 specifies a polarographic procedure — including principle, reagents, apparatus, sampling, test procedure, expression of results and test report — for determining lead in commercial zinc grades. The method is intended for zinc types such as Zn 99,5; Zn 98,5; and Zn 98 and is suitable for lead contents in the approximate range 0,1 % to 3 %.

General information

• Status: Withdrawn.
• Publication date: June 1975 (first edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.120.60 (Chemical analysis; zinc).
• Edition / version: Edition 1 (1975).
• Number of pages: 2 pages (concise method specification).

Primary bibliographic and lifecycle data as recorded by ISO and standard repositories.

Scope

Applies to the polarographic determination of lead in selected commercial zinc grades (notably Zn 99,5; Zn 98,5; Zn 98). The method covers required reagents and their preparation, polarographic apparatus and settings, sampling and sample preparation, step-by-step determination procedure, calibration/standard solutions and calculation/reporting of results. The method target range is broadly 0,1 % to 3 % lead by mass. It was intended for routine quality control and laboratory analysis of zinc metal and ingots.

Key topics and requirements

• Principle of the polarographic determination of lead in zinc matrices.
• Reagent specifications and preparation of lead standard solutions for calibration.
• Required apparatus and recommended polarographic operating conditions.
• Sampling rules and sample preparation steps for zinc ingots and products.
• Procedure for measurement, calculation of lead content and expression of results.
• Reporting format and precision/limits of applicability (approx. 0,1–3 % Pb).

Typical use and users

Used historically by analytical chemistry laboratories, metallurgical quality-control units at zinc producers and refiners, inspection bodies and research laboratories performing routine chemical analysis of zinc metal. Also of interest to standards librarians and historians of metallurgical analysis because the standard has been withdrawn.

Related standards

Closely related ISO documents (same subject area and era) include ISO 713:1975 (polarographic determination of lead and cadmium in zinc), ISO 714:1975 (determination of iron in zinc — photometric method), and sampling/reference documents for zinc ingots (e.g. ISO/R 752, ISO 3751 referenced in the procedure). Note: many mid-1970s analytical ISO publications have later been reviewed, confirmed, replaced or withdrawn.

Keywords

zinc; lead; polarography; analytical chemistry; chemical analysis; Zn 99,5; Zn 98,5; Zn 98; quality control; metallurgical analysis; ISO 715:1975.

FAQ

Q: What is this standard?

A: ISO 715:1975 is an International Standard that specified a polarographic method for determining lead content in specified commercial zinc grades.

Q: What does it cover?

A: It covers the analytical principle, reagents and their preparation, apparatus and operating conditions, sampling and sample preparation, stepwise test procedure, calibration (standard solutions), calculation of results and reporting. The method targets lead contents roughly between 0,1 % and 3 % in zinc.

Q: Who typically uses it?

A: Analytical laboratories, metallurgical plant quality-control teams, test houses and standards libraries — historically those responsible for verifying the chemical purity and lead impurity levels in zinc products.

Q: Is it current or superseded?

A: ISO 715:1975 has been withdrawn. Records indicate it is no longer an active ISO standard; users should check for current methods or replacement standards in the ISO catalogue or national standards bodies for up-to-date analytical practices. Some contemporaneous ISO zinc-analysis standards were themselves withdrawn or superseded.

Q: Is it part of a series?

A: It is part of the mid-1970s suite of ISO analytical standards for zinc (for example ISO 713, ISO 714) that address determination of trace or alloying elements in zinc by different analytical techniques. These were developed under ISO/TC 18 (metallurgical analyses).

Q: What are the key keywords?

A: Zinc; lead; polarographic method; chemical analysis; analytical procedure; Zn 99,5; Zn 98,5; Zn 98; ISO 715:1975.