ISO 2465:1974 PDF
Glycerols for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate photometric method
Glycerols for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate photometric method
- Статус документа:
- Отменён
- Формат:
- Электронный (PDF)
- Количество страниц:
- 3
- Дата публикации:
- 1 сентября 1974 г.
- Издание:
- ISO IS 2465 edition 1 version 1
- ICS:
- 71.080.60
The method is applicable tp products with a content greater than 0,1 mg/kg. It is applied to a test portion as it is, and to another identical portion with a known quantity of arsenic added. The principle consists in reduction of the arsenic by zinc in a hydrochloric acid medium, with the formation of arsine; absorption of the arsine in a solution of silver diethyldithiocarbamate in pyridine. Photometric measurement of the purplish-red colour produced by the colloidally dispersed silver at the maximum of the absorption curve at a wavelength of about 540 nm.
Технические детали
- Технический комитет
- ISO/TC 47 - Chemistry
- SKU
- ISO 2465:1974