Water quality — Determination of the chemical oxygen demand
Method specified is applicable to water with a value between 30 mg/l and 700 mg/l. The chloride contents must not exceed 1 000 mg/l. If the value exceeds 700 mg/l, the water sample is diluted. For greatest accuracy it is preferable that the value of the sample is in the range of 300 mg/l to 600 mg/l.
Wood-based panels — Determination of moisture content
Covers fibre building boards as defined in ISO 818, particle boards as defined in ISO 820, as well as plywood as defined in ISO 2074. The principle involves the determination, by weighing, of the loss in mass of a test piece between its state at the time of sampling and its state after drying to constant mass, and the calculation of this loss in mass after drying.
Metallic powders — Determination of oxygen content by reduction methods — Part 1: General guidelines
Gives some recommendations for the correct interpretation of the results obtained. The test methods are applicable generally to all powders of metals, alloys, carbides and mixtures thereof. The constituents of the powder shall be non-volatile and free of lubricant or organic binder. The limitations of the methods which depend upon the nature of the analysed metal are discussed in clause 4.
Metallic powders — Determination of oxygen content by reduction methods — Part 4: Total oxygen by re...
The test method is applicable to all powders of metals, alloys, carbides and mixtures thereof which are non-volatile under the test conditions. The sample may be in powder or compact form. The test is not applicable if the powder contains a lubricant or binder. This part of ISO 4491 shall be read in conjunction with ISO 4491-1.
Steel and iron — Determination of sulfur content — Infrared absorption method after combustion in an...
The method is applicable to sulphur contents between 0,002 % (m/m) and 0,10 % (m/m). Specifies principle, reagents and material, apparatus, sampling, procedure, expression of results and test report. Annex A gives additional information on the international cooperative tests. Annex B represents the precision date graphically. Annex C deals with induction furnaces and infrared sulfur analysers.
