ISO 6466:1983

Name: ISO 6466:1983 — Tobacco and tobacco products — Determination of dithiocarbamate pesticides residues — Molecular absorption spectrometric method
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Tobacco and tobacco products — Determination of dithiocarbamate pesticides residues — Molecular absorption spectrometric method

Название (английский):

ISO 6466:1983

Tobacco and tobacco products — Determination of dithiocarbamate pesticides residues — Molecular absorption spectrometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 1 июня 1983 г.
Издание:: ISO IS 6466 edition 1 version 1
ICS:: 65.160

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Описание (английский):

Covers residues from pesticides of the dithiocarbamate type commonly used on tobacco crops. Describes reagents and apparatus for the spectrometric measurement and gives information on the expression of results and the data to be included in the test report. The distallation apparatus to be used in the test is shown as an annex.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 6466:1983 specifies a molecular absorption spectrometric method for determining residues of dithiocarbamate pesticides in tobacco and tobacco products. The procedure measures the carbon disulfide (CS2) released by acid decomposition of dithiocarbamates, using a distillation/absorption step followed by UV spectrometric measurement. The standard describes required reagents, apparatus (including a distillation apparatus shown as an annex), calibration, result expression and reporting.

Key topics and technical requirements

Scope: Applicable to dithiocarbamate-type pesticides commonly used on tobacco crops; results are reported as mg CS2 per kg of sample and can optionally be converted to specific dithiocarbamate equivalents.

Reagents (analytical grade): examples given in the standard include concentrated sulfuric acid (96–98%), potassium hydroxide solution (~1 mol/L in 95% methanol), tin(II) chloride (SnCl2), concentrated hydrochloric acid and a sodium diethyldithiocarbamate standard solution (prepared fresh as CS2 equivalent).

Apparatus: laboratory distillation assembly (shown in annex), nitrogen source (50 mL/min flow), condenser, two absorber flasks (acid and KOH), and a UV spectrometer with 10 mm quartz/silica cuvettes.

Procedure highlights:

Acid decomposition with Sn(II) and HCl under nitrogen, distillation of formed CS2 and absorption in KOH/methanol.
UV absorbance measurements at 272 nm, 302 nm and 332 nm; corrected absorbance A_corr = A302 – (A272 + A332)/2.
Calibration using aliquots of the sodium diethyldithiocarbamate standard (CS2 equivalents) to build a calibration curve.

Quality control: repeatability requirement-difference between two determinations by the same analyst should not exceed 7.5% of their mean.

Reporting: results expressed on an as-is basis or converted to dry-matter basis using moisture content (ISO 6488); test report must document method details, deviations and any operational incidents.

Applications and users

Tobacco manufacturers and quality control laboratories monitoring pesticide residues in raw leaf and processed tobacco.

Regulatory and food/smoke-safety testing laboratories verifying compliance with pesticide residue limits.

Analytical chemistry labs performing method validation, inter-laboratory studies, or routine surveillance for dithiocarbamate residues.

Research organizations studying pesticide behavior and residue mitigation in tobacco production.

Related standards

ISO 1750 - common names for pesticides (reference for nomenclature).

ISO 4874 - sampling of tobacco lots (sample collection procedures).

ISO 6488 - determination of moisture content in tobacco (for dry-basis reporting).

Keywords: ISO 6466:1983, tobacco testing, dithiocarbamate residues, molecular absorption spectrometry, carbon disulfide, distillation apparatus, pesticide residue analysis.

ISO 6466:1983

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 6488:2021

Tobacco and tobacco products — Determination of water content — Karl Fischer method

ISO 1750:1981

Pesticides and other agrochemicals — Common names

ISO 4874:2020

Tobacco — Sampling of batches of raw material — General principles