1、 ENGINEERING STANDARDS Test Procedure SUPERCEDED EDS-T-7725 The Measuring Method for Water Contents Used by Karl-Fischer Method This standard may be applied only for current projects. It is Superceded for all future projects and replaced by ASTM D1123. ? Fp2-7 8F 3L.( ?U9I- Note: 8 E:48t G8 =97 FF7
2、957%L+ , FG P-P Program.Bd# ASTM D11238p) $4=F7 957F$ . Copyright 2011 General Motors Company All Rights Reserved August 2011 Originating Department: GM Korea Engineering Standards Page 1 of 5 Version : 5 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the
3、 event of conflict between the Korean and English language, the Korean language shall take precedence. 1.1 Purpose. This standard specifies the test method for water content in anti-freezing solution, brake fluid, washing solution, grease, lubricating oil and etc. 1.2 Applicability. This standard ap
4、plies to the determination of the water present in nonfreezing solution, braking solution, lubricating oil or various types of organic and inorganic substances by Karl Fischer reagent method quantitatively. 2 References Note: Only the latest approved standards are applicable unless otherwise specifi
5、ed. 2.1 External Standards/Specifications. ASTM D 1123 ASTM D 1744 KS M 0013 KS M 2058 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Equipment and Reagent. 3.1.1 Water Measuring Device. Waste measuring device consists of detective part made of glass electrodes
6、, an automatic titrating device, a stirrer, a used solvent treatment pump(661 pump unit), control devices for these and an indicator. 1 P7 :0 : ., E:48 6 4.2.16.1 Non-mineral oil: 150 ) 200 seconds. 4.2.16.2 Mineral lubricating oil: 200 ) 300 seconds. 4.2.16.3 Grease: 300 ) 450 seconds of EXTR. TIME
7、, and determine the required quantity of specimens according to the expected water content contained in the specimen depending on following Table. 4.2.17 Add 5 ml of Karl Fischer reagent manually after finishing the titrating of specimen to dip the electrodes sufficiently, and turn off the power sou
8、rces of the stirrer, the automatic titrating device, and the control device orderly. 4.2.18 Perform the procedures from 4.2.4 to 4.2.12 only when displacing Karl Fischer reagent and no performance has been taken for a long time. 4.2.19 When bubble is occurred in stirring specimen, electrode cant che
9、ck. So, it is necessary to stir specimen with decreasing the velocity of stirrer sufficiently 4.2.20 Detective part of electrode, which finished measuring water about ten times, shall be reused after washing with chloroform 5 Data 5.1 Evaluation. The water content of specimen shall be calculated by
10、the following formula to be appeared on the indicator and printed through the printer. Water Content (ppm) F1 = CO1 CO2 EP1COO Where, CO1: Equivalency factor of Karl Fischer reagent in terms of water content. CO2: 1000. EP1: Employed quantity of Karl Fischer reagent (quantity used for titrating: g).
11、 COO: Weight of specimen (g). 4.2.13 4.2.12 F72P F FACTOR F8x FMLA CONST 388?* #) CO1 7 0.0001 $88: 8)Y4A$ . 4.2.14 -Ld* !x E79P* 9PF G A)E *8p) 2l=F$ . 4.2.15 PARAMETER 388?* #) EXTR. TIME8x 120 sec) $4 999I 3L.(7 &d( $88 E7 8F7 4* :08(8x 99.H 8d F -Ld , 8%959Id , 99.H #6 4* -LF$ . 4.2.20 ELECTROD
12、8 98- .# 10 G 9I$ 3L.( ?U9I G A)E *8p) 2l=F G 817F$ . 5 4G $8Bd 5.1 D4 . 4*8 3L.(8t $88 47 8F7 , F8 1%L6 :4.7 E4%L+ F8*Bd) )Y%P$ . 3L.( (ppm) F1 = CO1 CO2 EP1COO 7 d2P , CO1: ? Fp2 768 3L. H3/x8 (Factor). CO2: 1,000. EP1: ? Fp2 768 2+( (959I7 17%P 6 : g). COO: 4*8 ,h (g). GM KOREA ENGINEERING STANDA
13、RDS EDS-T-7725 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 5 of 5 Version : 5 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the respons
14、ibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Karl-Fischer Method: A method of determination of water present in organic and inorganic substances using the quanti
15、tative reaction between water and iodine or sulfur dioxide in the presence of methyl alcohol and pyridine. Reaction formula) H2 O+I2 +SO2 +3C5H5N : 2C5H5NH1+C5H5NSO3 C5H5NSO3+ CH3OH: C5H5HNSO4CH3 In electric capacity titrating method, use iodide-ion mixed Karl Fischer reagent instead of iodine, and
16、generate iodine through electriolysis. (2I- : I2+2e). The quantity of iodine is in direct proportion to electrolyzed electric capacity according to Faradays law, and water (H2O) 1 mol and iodine 1 mol react quantitatively, so that water can be determined by measuring the electric capacity required f
17、or electrolysis. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to EDS-T-7725 9 Release and Revisions This standard was originated in June 1994. It was first approved by Engineering Stan
18、dard Committee in June 1994. It was first published in June 1994. 6 6|987 $4F 7 9 ., E:48t 88G ,p: , 86 , 8/x &%8x E FF 3L 8$ . ., E:48t 87 $4F 170 4)%P +& 6|98 ,l9P8 F8x 9P4F:# 6#$ . &d(2P 17 987 95FF 6|980 I 1B* 9DF , -18 9PF 728 957 7 .* 9IF# 8t ., E:4 1788 =y8 1F8$ . 7 768 9I8 7.1 98,l 76 . ? -F
19、p2 959I- : +D, 6 -C Fp*&L (Pyridine)8 98F72P 3L.8 77X& -C 81GG0 9I(958p) -L8 F# 8x 87F7 ,hd,p -C 8Td,p7 E F%P 3L.8 68x ?U9IF# -8$ . -L8 4 ) H2 O+I2 +SO2 +3C5H5N : 2C5H5NH1+C5H5NSO3 C5H5NSO3+ CH3OH: C5H5HNSO4CH3 98d( 959I-72P# 77X& $447 77X&G,p 878x GpFF ? -Fp2 468x 17F 98d.F7 8F 77X&* -P24A$ . (2I-:
20、 I2 + 2e). 8 77X&(8t D) $8 -?7 &d( 98F 98d(7 9I/x)tF ,p 1 mol0 77X& 1 mol8 9I(958p) -L8 F,) 98d .F7 Fx7F 98d(8x ?U9IF7 3L.(8x ?U9IF$ . 7.2 66 -C dGl . F$-1F 68 . 8 Ed - $* ,l2P! $+ &%72P ., E:48 87%T &# $80 M8 EdF$ . Test to EDS-T-7725 9 9P9I -C P9I 8)Y ., E:48t 1994 “x 6 87 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 1994“x 687 38%L6$ . ., E:48t 1994“x 687 ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 5 AUG 2011 Apply new Engineering Standard Template. Superceded (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 =* (G)8*4G D4 )
