ISO 3119-1976 rus PDF
Name in English:
St ISO 3119-1976 rus
Name in Russian:
Ст ISO 3119-1976 rus
Original standard ISO 3119-1976 rus in PDF full version. Additional info + preview on request
Full title and description
ISO 3119:1976 — Boric acid, boric oxide and disodium tetraborates for industrial use — Determination of chromium content — Diphenylcarbazide photometric method. A laboratory analytical method specifying alkaline fusion of a test portion followed by neutralization and photometric measurement of the chromium–diphenylcarbazide complex (absorption near 540 nm). A Russian-language (rus) version/translation is commercially available from standards distributors.
Abstract
This International Standard specifies a diphenylcarbazide photometric method for the determination of chromium in boric acid, boric oxide and disodium tetraborates for industrial use. The procedure uses alkaline fusion (sodium carbonate), neutralization with sulphuric acid, treatment with sodium azide to remove manganese colour interference, formation of the chromium–diphenylcarbazide complex and measurement of its absorbance at about 540 nm.
General information
- Status: Withdrawn (withdrawal recorded by ISO).
- Publication date: April 1976 (Edition 1, 1976-04-01).
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 71.060.01 — Inorganic chemicals in general.
- Edition / version: Edition 1 (1976).
- Number of pages: 3.
Scope
Applies to the determination of chromium content in industrial grades of boric acid, boric oxide and disodium tetraborates. The standard covers sample preparation by alkaline fusion, reagent and apparatus requirements, the photometric procedure using diphenylcarbazide, measures to eliminate manganese interference (sodium azide) and calculation/reporting of results. Intended for quality control and chemical analysis where low-level chromium determination in borate materials is required.
Key topics and requirements
- Sample preparation: alkaline fusion of a test portion using sodium carbonate and subsequent acid neutralization.
- Reagents: diphenylcarbazide as the chromogenic reagent; sodium azide to eliminate manganese colour interferences; use of analytical-reagent grade chemicals and purified water.
- Measurement: formation of the Cr–diphenylcarbazide complex and photometric measurement of absorbance near 540 nm (cells ~4 cm optical path recommended).
- Apparatus: conventional laboratory glassware, platinum dish for fusion, spectrophotometer or photoelectric absorptiometer with specified path length.
- Reporting: preparation of calibration/standard solutions and expression of results per the method’s calculation instructions.
- Material scope: specifically for boric acid, boric oxide and disodium tetraborates for industrial use.
Typical use and users
Used by analytical chemistry laboratories, quality control units at borate manufacturers and processors, regulatory and inspection laboratories, and research groups working with borates or requiring chromium impurity quantification in borate materials. The method is suitable where routine, low-level photometric determination of chromium in borates is needed.
Related standards
Related ISO test-method standards for chromium determination and borate analysis include other ISO methods for chromium in metals and ores (for example ISO standards that use diphenylcarbazide photometric techniques) and adjacent borate test standards for moisture, chloride and iron content. Examples of related ISO documents and classifications include ISO 3978 (chromium determination in aluminium/alloys by diphenylcarbazide techniques) and several ISO methods in the 3000–3200 range dealing with borates and related analytical procedures.
Keywords
Boric acid, boric oxide, disodium tetraborates, chromium determination, diphenylcarbazide, photometric method, spectrophotometry, alkaline fusion, sodium azide, ISO 3119:1976, analytical chemistry.
FAQ
Q: What is this standard?
A: ISO 3119:1976 is an ISO analytical standard that specifies a diphenylcarbazide photometric method for determining chromium in boric acid, boric oxide and disodium tetraborates for industrial use.
Q: What does it cover?
A: It covers sample fusion (alkaline fusion with sodium carbonate), neutralization, reagent and apparatus requirements, steps to remove manganese interference (sodium azide), formation of the chromium–diphenylcarbazide complex and photometric measurement of absorbance at about 540 nm, plus result calculation and reporting.
Q: Who typically uses it?
A: Industrial and contract testing laboratories, manufacturers of borates and downstream processors, regulatory/inspection labs and researchers needing to quantify chromium impurities in borate materials.
Q: Is it current or superseded?
A: ISO 3119:1976 is listed by ISO as Withdrawn. Some reseller records indicate a formal withdrawal date in 2002; it is not shown as an active current ISO standard. Users should check national adoption or replacement methods if current compliance is required.
Q: Is it part of a series?
A: It belongs conceptually to the family of ISO analytical/method standards for chemical determination in inorganic materials (ISO technical work on borates and chromium determination). Related ISO methods address chromium in other matrices (metals, ores) and other test methods for borates (moisture, chloride, iron).
Q: What are the key keywords?
A: Boric acid; boric oxide; disodium tetraborates; chromium; diphenylcarbazide; photometric; spectrophotometer; alkaline fusion; sodium azide; ISO 3119; 1976.