ISO 622:1981

Solid mineral fuels — Determination of phorphorus content — Reduced molybdophosphate photometric method

Datum objavljivanja: 1. 8. 1981.

95.99 Povučen 18. 11. 2016.

Опште информације

Trenutna faza: 95.99 Effective date: 18. 11. 2016.

Inicijator: ISO

Pripada: ISO/TC 27/SC 5

Vrsta: Međunarodni standard

ICS: 75.160.10

Jezik: francuski engleski

Kupovina

Status: Povučen

PDF

Papir

PDF i papir

Jezik

Jezik na kome želite da primite dokument.

Apstrakt

For taking the phosphorus into solution the following two methods are specified: The carbonaceous material is removed by ashing in amuffle furnace under specified conditions and the phosphorus is extracted by treatment with hydrofluoric and sulphuric acids. The carbonaceous material is removed by repeated oxidation with nitric acid in the presence of sulphuric acid. The determination is carried out by adding ammonium molybdate and ascorbic acid solution and measuring the absorbance of the resulting blue solution by a siutable optical instrument.