ISO 3705:1976

Name: ISO 3705:1976 — Sulphur for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate photometric method
SKU: ISO 3705:1976
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Sulphur for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate photometric method

Название (английский):

ISO 3705:1976

Sulphur for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate photometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 2
Дата публикации:: 1 сентября 1976 г.
Издание:: ISO IS 3705 edition 1 version 1
ICS:: 71.060.10

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Описание (английский):

Applicable to products having As contents equal or more than 0.5 mg/kg. In a well-ventilated cupboard, dissolution of a test portion in carbon tetrachloride. Oxidation of sulphur by bromine and nitric acid. Heating in a boiling water bath to eliminate the exess of bromine, carbon tetrachloride and nitric acid. The analysis is carried out according to ISO 2590. The replacement of some reagents shall be noted.

Abstract

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Стандарты, упомянутые в описании

Overview

ISO 3705:1976 specifies a silver diethyldithiocarbamate photometric method for the determination of arsenic in sulphur for industrial use. The method applies to sulphur samples with arsenic contents equal to or greater than 0.5 mg/kg and references the general procedures of ISO 2590 (General method for the determination of arsenic). Key laboratory operations include dissolution in carbon tetrachloride, chemical oxidation, and a spectrophotometric measurement of the arsenic-derivative.

Key topics and technical requirements

Scope: Applicable to industrial sulphur with As ≥ 0.5 mg/kg.

Sample preparation: Dry laboratory sample (about 80 °C), grind to pass a 630 μm sieve; typical test portion ≈ 5 g.

Dissolution and oxidation: Dissolve test portion in carbon tetrachloride; oxidize sulphur using bromine and nitric acid. Example reagent additions in the standard: add 20 ml bromine solution, stand 45 min, then add ~25 ml nitric acid dropwise while cooling.

Removal of excess reagents: Heat in a boiling water bath and evaporate (or sand bath) to eliminate excess bromine, carbon tetrachloride and nitric acid; fume until nitrous compounds are removed and dilute.

Analysis: Follow ISO 2590 procedures for arsenic determination using the silver diethyldithiocarbamate photometric reaction and calibration graph. For different concentration ranges, prepare volumetric dilutions and take specified aliquots for measurement.

Reagents and substitutions: The standard replaces hydrochloric acid (ISO 2590 reagent) with sulphuric acid for this method; note and report any other reagent substitutions. Bromine solution composition and nitric acid strength are specified.

Safety: Operations involve toxic/volatile chemicals (carbon tetrachloride, bromine, nitric acid, pyridine noted in ISO 2590); perform work in a well-ventilated fume cupboard.

Quality control: Include blank tests and calibration graphs per ISO 2590; report results, method reference, deviations or unusual features.

Applications and users

Who uses it: Analytical chemists, quality-control laboratories, industrial producers of sulphur and sulphur-containing products, environmental labs monitoring arsenic contamination.

Practical use: Routine QC of industrial sulphur, verification of supplier specifications, regulatory compliance testing where arsenic content must be quantified above trace levels, and inter-laboratory method standardization.

Related standards

ISO 2590 - General method for determination of arsenic (silver diethyldithiocarbamate photometric method)

ISO 2866, ISO 3425, ISO 3426, ISO 3704, ISO 5793 - other ISO methods related to sulphur analysis and quality parameters

Keywords: ISO 3705, arsenic determination, sulphur for industrial use, silver diethyldithiocarbamate photometric method, spectrophotometric analysis, carbon tetrachloride oxidation, bromine, nitric acid.

ISO 3705:1976

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 25901-2:2022

Welding and allied processes — Vocabulary — Part 2: Health and safety

ISO 2866:1974

Sulphur for industrial use — Determination of total carbon content — Titrimetric method

ISO 3425:1975

Sulphur for industrial use — Determination of ash at 850-900 degrees C and of residue at 200 degrees C

ISO 3426:1975

Sulphur for industrial use — Determination of loss in mass at 80 degrees C

ISO 3704:1976

Sulphur for industrial use — Determination of acidity — Titrimetric method

ISO 5793:1978

Sulphur for industrial use — Determination of chloride content — Photometric method