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BS ISO 7530-1:2015 pdf free
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BS ISO 7530-1:2015 pdf free.Nickel alloys一Flame atomic absorption spectrometric analysis Part 1: Determination of cobalt, chromium, copper, iron and manganese.
This part of Iso 7530 describes flame atomic absorption spectrometric methods for the determination of cobalt, chromium, copper, iron, and manganese in nickel alloys which can be dissolved in the nitric- hydrochloric acids mixture specified.
For each element, the method is applicable to the content range between 0,01 % and 4 %.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Iso 385, Laboratory glassware — Burettes
ISO 648, Laboratory glass ware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
3 Principle
Dissolution of a test portion in a nitric—hydrochloric acids mixture, evaporation of acids excess, and dissolution of the salts.
Addition of an ionization suppressant if necessary and dilution of the solution to a known volume.
Nebulization of the test solution after suitable dilution, if necessary, into an air/acetylene or a nitrous oxide/acetylene flame of an atomic absorption spectrometer.
Measurement of the absorption of the energy of the resonance line from the spectrum of the element being determined and comparison with that of calibration solutions of the same element.
4 Reagents
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity.
4.1 Nitric acid, (HNO3) P20 = 1,41 g/ml.
4.2 Nitric acid solution, 1 + 1.
Add 500 ml of nitric acid (4J,) to 500 ml of water.
4.3 Hydrochloric acid, (HCI) P20 = 1,18 g/ml.
4.4 HydrochlorIc acid solutIon, 1 + 1.
Add 500 ml of hydrochloric acid (4.3) to 500 ml of water.
4.5 Nitric-hydrochloric acids mixture.
CAUTION — This acid mixture is highly corrosive and unstable. Noxious gas (chlorine) is liberated on standing. It shall be prepared and used In a fume cupboard and shall not be kept In a closed container.
Carefully mix one part of nitric acid (4.2) and three parts of hydrochloric acid (4.3). This mixture is not stable and should be prepared only as needed.
4.6 Strontium chloride solution.
Transfer 113,5 g of strontium chloride hexahydrate (SrCI2 . 6H20) into a 600 ml beaker and dissolve in 400 ml of hot water (50 °C to 60 °C). Cool, transfer into a 1 000 ml one-mark volumetric flask, dilute to the mark with water, and mix.
4.7 Hydrogen peroxide, 300 g/l solution.
4.8 Cobalt standard solution, 1,000 g/l.
Weigh I g ± 0,001 g of cobalt (Co  99,9%) and transfer it into a 400 ml beaker. Add 30 ml of hydrochloric acid solution (4.4), cover with a watch glass, and heat gently until the cobalt is completely dissolved. Cool to room temperature, transfer the solution quantitatively into a 1 000 ml one-mark volumetric flask, add 35 ml of hydrochloric acid (4.3). dilute to the mark with water, and mix well.
1 ml of this solution contains 1,000 rng of cobalt.
4.9 Cobalt standard solution, 0,025 g/l.
Transfer 5,0 ml of cobalt standard solution (4) into a 200 ml one-mark volumetric flask and add 10 ml of hydrochloric acid (43). Dilute to the mark with water and mix well. Prepare this solution immediately prior to use.
1 ml of this solution contains 0,025 mg of cobalt.BS ISO 7530-1 pdf free download.


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