ISO 2752-1973 rus PDF
Name in English:
St ISO 2752-1973 rus
Name in Russian:
Ст ISO 2752-1973 rus
Original standard ISO 2752-1973 rus in PDF full version. Additional info + preview on request
Full title and description
St ISO 2752-1973 rus — Russian-language edition of ISO 2752:1973, "Urea for industrial use — Measurement of the variation of pH in the presence of formaldehyde — Potentiometric method". This publication specifies a potentiometric titration procedure to measure the change in pH of an aqueous urea sample after addition of formaldehyde, used for quality control and characterization of industrial urea.
Abstract
The standard defines the principle and procedure for potentiometric determination of the quantity of 0.01 N sodium hydroxide required to raise the pH of a solution containing a defined mass of urea (50 g in 100 ml water) to pH 8.3 after addition of formaldehyde; measurements are specified at (20 ± 0.5) °C. The method was approved by IUPAC at the time of publication.
General information
- Status: Withdrawn (listed as withdrawn in the ISO catalogue).
- Publication date: December 1973 (Edition 1, 1973-12).
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 71.080.30 (Chemicals — Urea and related products).
- Edition / version: Edition 1 (1973).
- Number of pages: 2 pages (short method/specification).
Scope
Specifies a potentiometric titration method to measure the variation of pH of industrial urea in the presence of formaldehyde. The procedure gives conditions (sample size, solvent, temperature, titrant concentration, and pH endpoint) and is intended for routine laboratory determination related to product specification and process control in urea production and formulation.
Key topics and requirements
- Potentiometric titration principle for pH variation measurement.
- Test conditions: 50 g sample in 100 ml water, temperature (20 ± 0.5) °C.
- Titrant: 0.01 N sodium hydroxide standard volumetric solution; endpoint pH 8.3.
- Short method specification suitable for routine quality control (2-page procedure).
- Method historically approved by IUPAC (as noted in ISO committee records).
Typical use and users
Analytical and quality-control laboratories in fertilizer and chemical production (urea manufacturers and formulators), research laboratories working with urea-based products, standards organizations and testing laboratories that compare or archive historical analytical methods. The Russian edition (rus) is used where Russian-language documentation is preferred or required.
Related standards
Other ISO methods and documents for urea and related chemical determinations (for example ISO 2751 series of urea test methods) and national equivalents or later replacements for withdrawn methods; consult the ISO catalogue or national standards bodies for current methods.
Keywords
ISO 2752, urea, potentiometric titration, pH variation, formaldehyde, 0.01 N NaOH, industrial urea, method, Russian edition, withdrawn.
FAQ
Q: What is this standard?
A: ISO 2752:1973 (Russian edition titled St ISO 2752-1973 rus) is an ISO method describing a potentiometric procedure to measure the variation of pH of industrial urea in the presence of formaldehyde.
Q: What does it cover?
A: It covers the principle and stepwise procedure for titrating an aqueous urea solution (50 g in 100 ml) with 0.01 N NaOH at (20 ± 0.5) °C until pH 8.3 is reached after formaldehyde addition; the document is a short (2-page) method specification.
Q: Who typically uses it?
A: Chemical and fertilizer industry QC laboratories, testing houses, research labs working with urea formulations, and standards libraries needing the Russian-language version.
Q: Is it current or superseded?
A: ISO 2752:1973 is listed as withdrawn in the ISO catalogue; users should consult the ISO database or national standards bodies for any current replacement methods or updated procedures.
Q: Is it part of a series?
A: It belongs to the cluster of ISO methods for urea and related chemical analyses (ICS 71.080.30); related ISO documents (for example ISO 2751 and other urea test-method standards) may cover complementary determinations.
Q: What are the key keywords?
A: Urea, potentiometric titration, pH variation, formaldehyde, sodium hydroxide 0.01 N, industrial urea, ISO 2752, Russian edition.