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“Step Out From the Old to the New”
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“The Right to Information, The Right to Live”
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“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 1559-6 (1982): Methods of chemical analysis of ferrosilicon, Part 6: Determination of calcium [MTD 5: FerroAlloys]
IS : 1559 ( Part VI ) - 1982 ( Reaffirmed 1992 )
Indian Standard
METHODS OF CHEMICAL ANALYSIS OF FERROSILICON
PART VI DEERMlNATlON Of CALCIUM
( First Rivision )
First Reprint JANUARY 1998
UDC G69.15’782-198 : 543 : 546.41
0 Copyright 1982
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
Gr2 Mada 1!3S2
CHEMICAL
PART V1
IS : 1559 ( Part VI ) - 1982
Indian Standard METHODS OF
ANALYSIS OF FERROSlLICON
DETERMINATION OF CALCIUM
( First Revision )
Methods of Chemical Analysis Sectional Committee, SMDC 2
Rcprmnting
Stcrl Authority of India I.td ( Dtlrgapllr Steel Plant ), Dtrrgaprlr
Strcl Authority of India Ltd ( Uhilai Steel Plant ), Bhilai
Swnr R. K. GUPTA ( Allernnte ) SHRT J. H,I,~.~.~A,:,,AILJ,c~ Ministry of Drfrnre ( DGI )
SHKI M. K. CHAKRAVORTY ( Affcrnnfe ) Da V. M. RJILrCH.\tL National Physical I.ahoratory ( CSIR ), New Delhi SHRI S. N. %HTI?EII S~wl Authority of Tntlin Lttl ( Ro~rrkcla Steel
Plant ), Ronrkvla SHRl B. MaHAP \TRA ( .~hnflt~ )
SHRI P. CHAKHA Indian Metals & Ft%rro Alloys Ltd, Koraput DIG M. M. Cf1.4~~ \RORTY Indian Iron ant1 Slrrl (:o Ltd, Burnprlr
Srrnr M. S. CHATTEK.TRE ( Alternate ) SHRI A. W. CHAWATHE India Govrrnment hlint ( Ministry of Finance ),
Ilornba) CHEMIST & METALLLWGET, hfinistry of Railways SOUTH CI':NTTLAL. R~II.WAY, SE~TJNDER.~~AD
ASSISTANT DIRECTOR ( MET ), RDSO, CHITTARANJAN ( Alternafe )
CHIEF CHEMIST ‘rhe Tata Iron & Steel Co Ltd, ,Jamnhcdpur ASSISTANT CHIEF CHEMIST ( Afternale )
DR A. N. CHOWDHURY Gcolngiral Survey of India, Calcutta SHRI B. N. BHATTACHARYA ( Alternate )
SERI H. P. DURRY Sational Test Housr, Calcutta DR B. C. DUTTA Hharat Alllminirlm Co~upan~ Ltd, Xow Jlclhi
SHKT K. P. MTJKHEI~JEE ( dltcrnote j
@ Copyreht 1982 BUREAU OF INDIAN STANDARDS
This publication is protected under the Indian Cnpyri,fhf Act ( XIV of 1957 ) and reproduction in whole or in part by any mrans ex,cept with written permission of the publisher shall be deemed to be an infringf,ment of copyright under the said Act.
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IS : 1559 (Part VI ) - 1982
Part III Determination of sulphur
Part IV Determination of phosphorils
Part V Determination of aluminium
Part VII Determination of manganese
0.3 In reporting the results of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to bc rounded off, it shall be done in accordance ivith IS : Z-1960*.
1. SCOPE
1.1 This standard ( Part \‘I ) covers the dcterminarion of calcium ( up to .? percent A&x ) in ferrosilicon.
2. SAMPLING
2.1 It shall be drawn and prepared in accordance with IS : 1472-1977t.
3. QUALITY OF REAGENTS
3.1 Unless otherwise specified pure chemicals and distilled water ( see IS : 1070-1977$ ) shall be employed in the tests.
NOTE ~- ‘ Pure chemicals ’ shall mean chemicals that do not contain impurities which affect the results of analysis.
4. OUTLINE OF THE METHOD
4.1 The sample is dissolved in hydrofluoric and nitric acids in a platinum crucible and the excess of acids is removed by evaporation to dryness and ignition. The residue is then fused by a mixture of sodium carbonate and potassium carbonate and the melt extracted in dilute hydrochloric acid. The solution is evaporated to syrupy consistency followed by fuming with perchloric acid. From the solution, R20s is separated by precipitation with ammonium hydroxide. From the filtrate, calcium is determined by complexometric titration \vith EDT.4 using either Calcein or Murexide as indicator.
5. REAGENTS
5.1 Hydrofluoric Acid - 40 percent.
*Rules for rounding off numerical values ( reoiscd ). TM&hods of sampling ferro-alloys for determination of chemical composition
( first reuision ) . tspecification for water for general laboratory use ( second c&ion ).
4
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IS : 1559 (Part VI ) - 1982
6.4 Evaporate the combined filtrates, if necessary, to a volume of about 200 ml. Transfer the solution to a measuring flask of 250 ml, dilute to the mark and take the aliquot. To the aliquot, add 3 ml of sodium hydroxide solution and dilute to about 100 ml. Titr ..te with standard solution of EDTA using Calcein or Murexide as an indicator.
6.5 Calculation
AXBX 100 Calcium, percent = -c-P
where
A = volume in ml of standard EDTA solution required to titrate the aliquot,
B w Equivalent calcium in g per ml of standard EDTA solution, and
C - Mass in g of the sample represented by f he aliquot taken.
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