ISO 3815-2 pdf download – Zinc and zinc alloys一 Part 2: Analysis by inductively coupled plasma optical emission spectrometry

ISO 3815-2 pdf download - Zinc and zinc alloys一 Part 2: Analysis by inductively coupled plasma optical emission spectrometry

ISO 3815-2 pdf download – Zinc and zinc alloys一 Part 2: Analysis by inductively coupled plasma optical emission spectrometry.
5.9 Mono-element standard solutions
Prepare solutions of 1 gil of lead, cadmium. Won, copper, aluminium and magnesium, by dissolving 1 g of each of these metals, weighed to the neerest 0.001 g, in the acid mixture (5.7) and making up to volume with the acid mixture (5.7)
Prepare a solution of 1 gil of tin, by carefully adding 100 ml of hydrochloric acid (5.1) to 1 g of pure tin. When dissolution Is complete, cool and transfer quantitatively to a 1 000 ml volumetric flask. Dilute to the mark with water and mit
By dilution, prepare standard solutions of 100 mg/I and 10 mgll. if necessary (see 6.2),
5.10 Aluminium standard solution, to be used for alloys with aluminium content>3% (mass fraction).
Prepare a solution of 50 gIl by dissolving 69529 of aluminium nitrate nonahydrate (5.6), weighed to the nearest 0,1 g, in water. Transfer to a II volumetric flask, add 40 ml of tartaric acid solution (&4). dilute to the mark with water and mix.
By taking an appropriate aliquot, determine the exact aluminium content in accordance with ISO 1169.
5.11 Internal standard solution
Weigh 6,25 g of ‘(203 (yttrium oxide pa.), to the nearest 0,01 g, and transfer into a SI volumetric flask. Add about 2,5 I of water, 250 ml of nitric acid (5-2) and warm gently until dissolution. Cool to room temperature. dilute to the mark with water, and mix
6 Sampling
Sampling shall be In accordance with ISO 20081.
7 Preparation of test solutions
7.1 Test portion
Weigh 109 of the test sample to the nearest 0.001 g.
7.2 Preparation of the test solution
Introduce the test portion Into a 500 ml beaker fitted with a watch-glass cover and dissolve by carefully adding 10 ml of tartaric acid solution (5.4) and 50 ml of nitric acid (5.2).
Alternatively, dissolve the test portion In 50 ml of hydrochloric acid-nitric acid mixture (45+1). In this case, zinc solution (5.8) and standard solutions (5.9). (5.10) are also prepared such that the resulting calibration solutions (8.2) have an acid composition identical to the sample solution.
After dissolution, transfer quantitatively to a 250 ml volumetric flask, add 10 ml of internal standard solution (5.11) and, after cooing to room temperature, make up to the mark with water and mix.
Into each of seven 250 ml volumetric flasks, transfer appropriate volumes (between 1 ml and 50 ml) of the relevant solutions (5.8, 5.9, 5.10). Calculate each volume to contain the exact mass of analyte such as to give a total mass of 10g. In order to obtain direct reading in percent (mass fraction) in accordance with Table 1. Acid 10 ml of intemal standard solution (5.11), dilute to the mart with acid mixture (5.7), and mix.
Use intemal standardization and background correction techniques, if these techniques optimize the calibration graphs The correlation coefficient of each calibration graph should be at least 0.999
In order to validate the calibration graphs, it is recommended to analyse a certified reference matenal (CRM), it available.
8,3 Method of testing
In general, each test solution shall be tested at least two times. If malfunction of the spectrometer is suspected,
perform additional tests.
8.4 Expression of results
Test results shall be expressed as mass fraction, calcutated as the arithmetic mean of all valid sEigle results of the test sequence according to 8.3, exduding failing single test
Express results in accordance with ISO 301. ISO 752, EN 12844 and EN 988.
8.5 Test report
The test report shall include following items:
a) identification of sample;
b) test result of each test sequence according to 8.4;
c) name of laboratory or testing organization;
d) date of the test report;
e) reference to this part of ISO 3815 (ISO 3815-2);
0 signature of the laboratory manager or other responsible person.

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