British Chemical Standard, BCS-CRM 346, is sold in bottles containing 100g chips graded 1700 - 250µm (10 - 60 mesh) for chemical analysis. Date of this edition: October 2019. (The current edition is available at www.basrid.co.uk) Page 2 of 2 BCS-CRM 346 NICKEL ALLOY IN 100 NOTES ON METHODS USED LEAD Analysts Nos. 1, 4, 5, 7, 9, 10, 12 and 14 determined lead by Electrothermal Atomisation Atomic Absorption Spectrometry (ETAAS) directly on an acid solution of the alloy prepared, in most cases, by dissolving in hydrofluoric/nitric acids and evaporating off most of the excess acids1. Analysts Nos. 2 and 3 used Flame Atomic Absorption Spectrometry (FAAS) without separation. Nos. 8, 11 and 13 extracted lead into 4-methylpentan-2-one/Tri-n-octylphosphine oxide (TOPO) from an iodide solution2 and completed by FAAS on the organic extract. Analyst No. 15 extracted lead into 4-methylpentan-2-one/TOPO from an iodide solution2 and measured by square wave polarography after conversion to an aqueous medium. Analysts Nos. 4 and 15 also determined lead by FAAS after extraction into 4-methylpentan-2-one/TOPO and found 21.0 and 19.8µg/g respectively. BISMUTH Analysts Nos. 1, 5, 9, 10, 12 and 14 determined bismuth by ETAAS directly on an acid solution as described under Lead. No. 2 separated bismuth by anion exchange and completed by ETAAS. Nos. 3, 4, 8, 11 and 13 used FAAS after extraction into 4-methylpentan-2-one/TOPO from an iodide soluton2. Analyst No. 15 used square wave polarography for measurement after extraction with iso-octyl thioglycollate. Analyst No. 4 also determined bismuth by ETAAS directly on an acid solution and found 10.0µg/g. No. 15 also used FAAS after 4-methylpentan-2-one/TOPO extraction and found 10.4µg/g. SILVER Analysts Nos.1, 2, 3, 4, 5, 7 and 10 determined silver by FAAS without separation. Nos. 8 and 13 extracted with 4-methylpentan-2-one/TOPO from an iodide solution2 and completed by FAAS. Nos. 9, 11, 12 and 14 used ETAAS directly on an acid solution as described under Lead. SELENIUM All Analysts determined selenium by ETAAS on acid solution of the alloy prepared, in most cases, by dissolving in hydrofluoric/nitric acids and evaporating off most of the excess acids1. TELLURIUM Analysts Nos. 1, 3, 5, 7, 9, 10 and 12 determined tellurium by ETAAS on an acid solution of the alloy1. Nos. 4 and 11 extracted with 4-methylpentan-2-one/TOPO from an iodide solution2 and completed by FAAS. No 15 used square wave polarography for measurement after extraction with iso-octyl thioglycollate. THALLIUM Analysts Nos. 1, 11 and 15 extracted with 4-methylpentan-2-one/TOPO from an iodide solution2. Nos. 1 and 15 completed by FAAS and No. 11 completed by ETAAS. Nos. 3, 9, 10 and 12 used ETAAS directly on acid solutions' ANTIMONY Analysts Nos. 1, 4 and 8 determined antimony by FAAS after extraction in 4-methylpentan-2-one/TOPO from an iodide solution2. Nos. 2 and 10 used ETAAS directly on acid solutions1. Analyst No. 4 also determined antimony by ETAAS directly on an acid solution and found 45.0µg/g. ARSENIC Analysts Nos. 1 and 15 extracted arsenic as iodide3 and chloride respectively into chloroform and completed photometrically as molybdenum blue. Nos. 2 and 10 used ETAAS directly on an acid solution1. Analyst No. 3 determined arsenic by hydride vapour FAAS. Analyst No.1 also determined arsenic by FAAS using an iodide extraction as described above, acidified with nitric acid and found 47.0µg/g. No. 2 also used a photometric method involving absorption of arsine in silver diethyldithiocarbamate/ephedrine in chloroform and found 55.5µg/g. CADMIUM Analysts Nos. 1, 4, 5 and 11 determined cadmium by ETAAS directly on acid solutions1. No. 2 used ETAAS after separation by anion exchange. GALLIUM Analyst No. 1 determined gallium by FAAS after extraction with 4-methylpentan-2-one/TOPO from a 7 molar hydrochloric acid solution. No.2 extracted gallium as the chloride with diethyl ether, removed molybdenum with α-benzoin oxime and evaluated by Flame Atomic Emission Spectrometry (FAES). No. 4 used a photometric method with brilliant green. No. 7 used ETAAS directly on an acid solution. Analyst No. 15 determined gallium by ETAAS directly on an acid solution1. TIN Analysts Nos. 1, 8, 11, and 13 determined tin by FAAS after extraction with 4-methylpentan-2-one/TOPO from an iodide solution2. The remaining Analysts used ETAAS directly on acid solutions1. ZINC All Analysts determined zinc by FAAS directly. MAGNESIUM All Analysts determined magnesium by FAAS directly. CALCIUM All Analysts used direct FAAS. INDIUM All Analysts determined indium by ETAAS after extraction with 4-methylpentan-2-one/TOPO from a 7 molar hydrochloric acid solution, No. 14 after digestion with hydrofluoric and nitric acids. References 1. Welcher, Kriege and Marks, Anal. Chem., 1974, 46, 1227 2. Burke, Analyst 1972, 97, 19 and Burke and Thornton, Analyst, 1974, 99, 469 3. Fogg, Marriott and Thorburn-Burns, Analyst 1972, 97, 657.

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