ISO 20260:2019 pdf free
ISO 20260:2019 pdf free.Magnesium and magnesium alloys – Determination of mercury
Sampling shall be carried out as follows.
a) When the chips are sampled from a casting sample (A) or a product sample (B), select the sampling position so as to represent the quality of the sample, and penetrate the sample by boring at right angles to its surface. In the case of a sample with a thickness not penetrable from one direction,another suitable method (e.g. boring from two directions) shall be used.
b) Prior to boring for chipping, clean the drill (which is not more than 10 mm in diameter) using ethanol. Remove the adhered matters on the surface of the sampling position, and then carry out the boring, without using any sort of oils or lubricant and with just enough force to drill without oxidizing the sample chips. At this time, adjust the pressure exerted or the revolution frequency of the drill so that no excessive heat is generated. Do not attempt to cool off or stop the temperature from rising by pouring water or another liquid over the sample.The use of cutting tools other than a drill, such as a lathe, is permissible.
c) Collect all of the sample chips (which shall be no larger than 10 mm), and remove iron powder, etc.,using a strong magnet. Then, mix the chips together thoroughly to create the analytical sample and leave them in a desiccator to cool to room temperature.
d) If the sampling from specimens such as thin sheets, pipes, etc, cannot be in accordance with the specifications given in a) to c), the sampling method shall be as agreed by the purchaser and the supplier.
The aqueous solution including the chipped magnesium sample is added with solution of permanganateion prior to dissolution. The solution is then decomposed with nitric acid, thus supressing volatilization of mercury in the sample. Precipitates of manganese(IV) oxide generated during decomposition are reduced with hydroxyl ammonium chloride. The prepared solution is sprayed into the argon plasma of the ICP mass spectrometer and the ion intensities of mercury are measured.ISO 20260 pdf free download.
