ISO 6634-1982 PDF
Name in English:
St ISO 6634-1982
Name in Russian:
Ст ISO 6634-1982
Original standard ISO 6634-1982 in PDF full version. Additional info + preview on request
Full title and description
Fruits, vegetables and derived products — Determination of arsenic content — Silver diethyldithiocarbamate spectrophotometric method.
Abstract
The standard specifies a wet-chemistry procedure in which a test portion is decomposed, arsenic(V) is reduced to arsenic(III) with tin(II) chloride, arsine is generated by nascent hydrogen, the arsine reacts with silver diethyldithiocarbamate to form a red-coloured complex, and the coloured complex is measured spectrophotometrically at about 520 nm to determine arsenic content.
General information
- Status: Published; International Standard (confirmed during periodic review).
- Publication date: December 1982 (Edition 1, 1982-12).
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 67.080.01 — Fruits, vegetables and derived products (general).
- Edition / version: Edition 1 (1982).
- Number of pages: 5 (concise method specification).
Scope
This International Standard specifies a spectrophotometric method using silver diethyldithiocarbamate for the determination of total arsenic in fruits, vegetables and derived products. It covers the chemical decomposition, reduction and arsine-generation procedure and the spectrophotometric measurement used to quantify arsenic in food matrices of this class.
Key topics and requirements
- Sample decomposition of organic matrix prior to analysis (wet decomposition techniques referenced).
- Reduction of arsenic(V) to arsenic(III) using tin(II) chloride.
- Generation of arsine gas by action of nascent hydrogen and trapping/reacting with silver diethyldithiocarbamate.
- Formation of a red-coloured complex and measurement of absorbance at approximately 520 nm for quantification.
- Normative references and links to related decomposition methods (example: ISO 5515 referenced for decomposition procedure).
Typical use and users
Used by food testing laboratories, quality-control units in food processing, regulatory and public-health laboratories, and researchers assessing arsenic contamination in fruit- and vegetable-based products. The method is suitable where a spectrophotometric arsine-generation technique is acceptable and when low-to-moderate sample throughput is required.
Related standards
Normative and related documents include ISO 5515 (decomposition of organic matter prior to analysis — wet method) and other ISO methods for determination of heavy metals in foodstuffs (related series produced by ISO/TC 34/SC 3). Some national bodies have adopted ISO 6634 as the basis for equivalent national standards (for example TCVN 5367:1991).
Keywords
arsenic; arsine; silver diethyldithiocarbamate; spectrophotometric method; fruits; vegetables; food analysis; heavy metals; ISO 6634:1982.
FAQ
Q: What is this standard?
A: ISO 6634:1982 is an International Standard that defines a silver diethyldithiocarbamate spectrophotometric method for determining arsenic content in fruits, vegetables and derived products.
Q: What does it cover?
A: It covers sample decomposition (wet), reduction of arsenic(V) to arsenic(III), generation of arsine, formation of a coloured complex with silver diethyldithiocarbamate and spectrophotometric measurement at about 520 nm for arsenic quantification.
Q: Who typically uses it?
A: Food and environmental testing laboratories, regulatory agencies, manufacturers of fruit/vegetable products, and researchers evaluating arsenic levels in such matrices.
Q: Is it current or superseded?
A: The ISO record shows ISO 6634:1982 as published in December 1982 and indicates the standard was reviewed and confirmed in recent systematic reviews (confirmed status in ISO records), so this 1982 edition remains the current published edition unless a later withdrawal or revision has been formally issued by ISO. Users should check the official ISO catalogue or national standards bodies for any post-2022 changes before relying on the method for compliance testing.
Q: Is it part of a series?
A: It is part of the body of ISO methods developed by ISO/TC 34/SC 3 for fruits, vegetables and derived products; related methods cover other analytes and procedures (see related ISO methods such as ISO 5515 and other heavy-metal methods for foods).
Q: What are the key keywords?
A: Arsenic; arsine; silver diethyldithiocarbamate; spectrophotometry; food analysis; fruits; vegetables; heavy metals.