British Chemical Standard, BCS-CRM 214/2 (ECRM 152-1), is sold in bottles containing 100g chips graded 1700 - 250µm (10 - 60 mesh) for chemical analysis. Date of this edition: June 2019. (The current edition is available at www.basrid.co.uk) Page 2 of 2 BCS-CRM 214/2 (ECRM 152-1) Mn-Mo STEEL NOTES ON METHODS USED CARBON All Analysts except Nos. 1, 4 and 5 determined carbon gravimetrically by combustion using the Standard method B.S. 1121: Part 11: 1967 or similar methods. Analysts Nos. 1 and 5 used high frequency combustion-infrared absorption. No. 4 determined carbon titrimetrically by the Ströhlein method. Analyst No. 8 also used a low-pressure method (Cook and Speight, Analyst, 1956, 81, 144) and found 0.39%. SILICON All Analysts determined silicon gravimetrically, all except No.1 by dehydration with perchloric acid, in most cases according to the Standard method B. S. 1121: Part 10: 1967. Analyst No. 1 dehydrated by evaporation with both hydrochloric acid and aqua regia. Analysts Nos. 4 and 6 also used photometric methods depending on the formation of molybdenum blue and found 0.18% in each case. MANGANESE Analysts Nos. 1, 2, 3, 5 and 8 determined manganese titrimetrically. Nos. 1 and 2 used direct Analoid methods whilst Nos. 3, 5 and 8 used BS 1121: Part 16: 1949, which includes a zinc oxide separation. Nos. 4, 6 and 7 used photometric methods after oxidation with periodate, Nos. 4 and 6 according to BS 1121: Part 23: 1951. Analyst No. 6 also used a direct titrimetric method and found 1.59%. No. 7 also used a volumetric method involving oxidation with bismuthate and found 1.61%. PHOSPHORUS Analyst Nos. 1 and 6 determined phosphorus titrimetrically after precipitation as phosphomolybdate. Nos. 2, 3, 4, and 5 determined phosphorus gravimetrically by precipitation as phosphomolybdate according to the Standard method B.S. 1121: Part 9: 1948, Nos. 2 and 5 finishing gravimetrically as lead molybdate and Nos. 3 and 4 finishing titrimetrically. Nos. 7 and 8 used a photometric method with phosphovanadomolybdate, No. 8 according to BS 1121: Part 45: 1966. SULPHUR All Analysts determined sulphur gravimetrically. Nos. 2 and 8 first carried out a chromatographic separation on an alumina column (Nydahl, Anal. Chem. 1954, 26, 580). Nos. 3, 4. 5, 6 and 7 used BS 1121: Part 1: 1966. Analysts Nos. 4, 6, 7 and 8 also used combustion methods and found 0.046%, 0.043%, 0.039% and 0.044% respectively. CHROMIUM Analysts Nos. 1, 2, 3, 5 and 7 determined chromium titrimetrically; Nos. 1 and 5 according to BS 1121: Part 13: 1954 and No. 2 by oxidation with persulphate and direct titration with Fe(II). Nos. 4, 6 and 8 used a photometric method with diphenylcarbazide, according to BS 1121: Part 24: 1952. Analyst No. 1 also used a photometric method with diphenylcarbazide and found 0.08%. Analyst No. 8 also used the titrimetric method BS 1121: Part 13: 1954 and found 0.10%. MOLYBDENUM All Analysts except Nos. 1 and 5 determined molybdenum photometrically as the oxythiocyanate, Nos. 2. 4 and 8 according to BS 1121: Part 48: 1966. Analysts Nos. I and 5 used gravimetric methods after precipitation with α-benzoin oxime. Analysts Nos. 1 and 5 also used photometric methods with thiocyanate and found 0.26% in each case. NICKEL Analysts Nos. 1, 3, 5, 6 and 8 determined nickel titrimetrically with potassium cyanide/silver nitrate after separation with dimethylglyoxime. No.2 separated with dimethylglyoxime, dissolved the precipitate and boiled with excess Fe(III).The resultant Fe(II) was titrated with dichromate. Nos. 4 and 7 used a photometric method with dimethylglyoxime, No. 4 following BS 1121: Part 6: 1948. COPPER Analysts Nos. 1, 5 and 7 determined copper titrimetrically after precipitation with sodium thiosulphate, No. 5 used BS 1121: Part 4: 1956. All other Analysts determined copper photometrically-, Nos. 2, 4 and 6 used bis-cyclohexanone oxalyldihydrazone whilst Nos. 3 and 8 used 2-2' diquinolyl according to BS 1121: Part 36: 1956. VANADIUM Vanadium was determined titrimetrically with Fe(II), after oxidation with permanganate.

View certificate