1、 ENGINEERING STANDARDS Test Procedure LIMITED USE EDS-T-7731 Standard for the Test Method for the Hardness of Industrial Water Do Not Use on New Program; No Replacement. )6 73L8 $ ?U9I- Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program 72P# 957%L: 6#$ . Copyright 2011 General Motors Company All Right
2、s Reserved August 2011 Originating Department: GM Korea Engineering Standards Page 1 of 4 Version : 3 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict between the Korean and English language, the Korean language shall take precedence.
3、1.1 Purpose. This standard specifies the test method for measuring the hardness of industrial water. 1.2 Applicability. This test method applies to measuring total hardness, calcium hardness, magnesium hardness, carbonate hardness and non-carbonate hardness of industrial water. 2 References Note: On
4、ly the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. KS M 0100 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Equipment. 3.1.1 Erlenmeyer Flask. The one with a capacity of 250 ml, made of glass. 3.1.
5、2 Buret. 3.1.3 Pipet. 3.1.4 Stirrer. 3.2 Reagent. 3.2.1 Total Hardness Buffer Solution. Dissolve 67.5 g of ammonium chloride (NH4Cl) into 570 ml of ammonia water (NH4OH) and add water until the volume reaches 1000 ml before plugging and storage it. 1 P7 :0 : ., E:48 6&F !7$ :4-8! 9I8x $4=F 3L 6$ . :
6、0 : F67t 7568 18 88x 7 , F6* 72T8p) F$ . 1.1 +95 . ., E:48t )673L8 $* ?U9IF# 4G -7 $4F7 9IF 8$ . 1.2 957 -88 . ., 4G -8t )673L8 Q$ , ?3$ , *,“X3$ , A170 $ -C /xA170 $* ?U9IF#$ 957F$ . 2 4) E:4 / :0 : C-H +d%P 9I8 6# F 48 07 38%P E:48x 957F$ . 2.1 17 E:4 / . KS M 0100 2.2 GM E:4 / . None 2.3 dA E:4 /
7、 . None 3 4G 88 3.1 4G 8/x . 3.1.1 15 F(3A . 7( 250 ml8 8T*9P8 . 3.1.2 /$)O . 3.1.3 3E 8& . 3.1.4 -Ld . 3.2 46 . 3.2.1 Q$ 7x 76 . Ammonium Chloride (NH4Cl) 67.5 g7 6+#6x3L (NH4OH) 570 ml7 7FF G ,p8x 4F2P 1000 ml4 %L F+ *P* a *6x .(4F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7731 Copyright 2011 Genera
8、l Motors Company All Rights Reserved August 2011 Page 2 of 4 Version : 3 3.2.2 Total Hardness Reagent. Dissolve 1 g of eriochrome black T (C20H12O7M3SNa) into 30 ml of water and add sodium carbonate (NaCO3) solution (30 g/ ) to adjust pH at 10.5. Regulate the total volume to 100 ml adding ethylalcoh
9、ol (95 %) or methylalcohol and stir before plugging and storage it in a brown glass bottle. 3.2.3 0.01M EDTA Reference Solution. 3.2.3.1 Dissolve exactly 3.722 g of disodium ethylene diamine tetraacetate (NA2 H2 EDTA) in water after drying it at 80 E for 5 hours and cooling it in a desiccator. Trans
10、fer the solution into a volumetric flask (1000 ml) and regulate the total amount to 1000 ml. 1 ml of this solution corresponds to 1mg of calcium carbonate (CaCO3). 3.2.3.2 Dissolve 4 g of disodium ethylene diamine tetraacetate in 800 ml of water and adjust it to pH 10.5 using NaOH (50 g/l) solution.
11、 Based on calcium chloride reference solution (1 ml = 0.2 mg CaCO3), make 1 ml of this solution correspond to 1 mg of CaCO3 by diluting. Reference solution shall be kept in a polyethylene plastic or light rubber bottle and used by occasionally reregulating its level. 3.2.3.3 Using one of the above m
12、ethods, use the selected solution as a 0.01M EDTA reference solution. 3.2.4 Potassium Cyanide Solution. Dissolve 10 g of potassium cyanide (KCN) in 100 ml of water. 3.2.5 Pulverize 0.5 g of calconcarboxylic acid 2-hydroxy-1-(2-hydroxy-4-sulfo-1- naphthylazo) naphthalene-3-carboxylic acid and 50 g of
13、 sodium sulfate unhydrous Na2SO4) to mix homogeneously and preserve it in a colored bottle. 3.2.6 Dissolve about 225 g of Potassium Hydroxide in 500 ml of water to make potassium hydroxide solution and preserve it in a polyethylene bottle. 3.2.7 Dissolve 10 g of hydroxyl amine hydrochloride (NH2OHHC
14、L) in 100 ml of water. 4 Procedures 4.1 Conditions. 4.1.1 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.2 Instructions. 4.2.1 Total Hardness. 4.2.1.1 Fill
15、the 250 ml erlenmeyer flask with 50 ml of sample and add 3 ) 5 drops of potassium cyanide, 1 ml of total hardness buffer solution and 1 ) 2 drop(s) of total hardness reagent. 3.2.2 ?i $ :46 . Eriochrom Black T (C20H12O7M3SNa) 1 g7 ,p 30 ml 7 7F4A Sodium Carbonate (NaCO3) 76 (30 g/ )7 4F7 pH* 10.5) 9
16、9Q $ . 4.2.1.1 4*3L 50 ml * 250 ml 15 F(3A 7 ?F 46|G ?* 76 3 ) 5-70 Q $ 7x 76 1 ml, Q $ :46 1 ) 2 -78x 4F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7731 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 3 of 4 Version : 3 4.2.1.2 Calculate the total hardness by taking the poin
17、t where the red color changes into blue as the end point after titration with a 0.01M EDTA reference solution. 4.2.2 Calcium Hardness. 4.2.2.1 Decant 50 ml of sample into the 250 ml erlenmeyer flask and add 4ml of potassium hydroxide to it and stir. Leave the stirred solution for 3 ) 5 minutes. 4.2.
18、2.2 Add potassium cyanide and hydroxyl amine hydrochloride, 0.3 ml each, to the solution and stir. Add about 0.1 g of calcium agent to it. 4.2.2.3 Calculate the calcium hardness by taking the point where the red color changes into blue as the end point after titrating with 0.01M EDTA reference solut
19、ion. 5 Data 5.1 Calculation. 5.1.1 Total Hardness. M, T = 1100uu SA Where, M, T = Total hardness (CaCO3) (ppm). A = Used amount of 0.01M EDTA reference solution (ml). S = Sample (ml). 5.1.2 Calcium Hardness. H-Ca = 1100 uu SA Where, H-Ca = calcium hardness (CaCO3) (ppm). A = Used amount of 0.01M EDT
20、A reference solution (ml). S = Sample (ml). 5.1.3 Magnesium Hardness Magnesium hardness (CaCO3) (ppm) = Total hardness - Calcium hardness 5.1.4 Carbonate Hardness and Non-Carbonate. Carbonate hardness and non-carbonate hardness can be calculated as follows from the relation between total hardness an
21、d M-alkali rate. 5.1.4.1 M-consumed amount of acid (M-alkali rate) Q $* 1F$ . 4.2.2 ?3 $ . 4.2.2.1 4*3L 50 ml * 250 ml 15 F(3A 7 ?F 3L1G ?*76 4 ml * 4F -LF7 3 ) 5.8 -?F$ . 4.2.2.2 46|G ?*76 -C 701H&)4 6x-0 76 0.3 ml68x 4F7 H& ?3:46 6 0.1 g8x 4F$ . 4.2.2.3 0.01M EDTA E:4768p) 959IF7 89518 =18p) %T &*
22、 9+9D (End Point)8p) F7 ?3 $* 1F$ . 5 4G $8Bd 5.1 1 . 5.1.1Q $ . M, T = 1100uu SA 7 d2P , H, T =Q$ (CaCO3) (ppm). A = 0.01M EDTA E:4768 17( (ml). S = 4*3L (ml). 5.1.2 ?3 $ . H-Ca = 1100uu SA 7 d2P , H-Ca = ?3$ (CaCO3) (ppm). A = 0.01M EDTA E:4768 17( (ml). S = 4*3L (ml). 5.1.3 *,“X3 $ . *,“X3 $ (CaC
23、O3)(ppm) = Q$ - ?3$ 5.1.4 A170 $ -C /xA170 $ . A170 $7t /xA170 $# Q$7t M-6?*$8 4).Bd $80 M8 1F$ 5.1.4.1 M-12/x( (M-6?*$ ) Q$ . 5.1.4.2 M-12/x( (M-6?*$ ) t Q$ . A170 $ = Q$ 5.1.5 Q$ CaCO3 ppm 8x % 8$ dGH ) G1F)X+ $848x &d*$ dGH = CaCO3 ppm 0.056 GM KOREA ENGINEERING STANDARDS EDS-T-7731 Copyright 201
24、1 General Motors Company All Rights Reserved August 2011 Page 4 of 4 Version : 3 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 responsibility of the user of this
25、standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Total Hardness: The value representing the total amount of calcium and magnesium contained in industrial water as a corresponding PPM of calcium
26、 carbonate (CaCO3). Calcium Hardness: The value representing the amount of calcium contained in industrial water as a corresponding PPM of calcium carbonate (CaCO3). Magnesium Hardness: The value representing the amount of magnesium contained in industrial water as a corresponding PPM of calcium car
27、bonate. Carbonate Hardness: The hardness indicated by carbonate and hydrogen carbide of calcium and magnesium. Non-Carbonate Hardness: The hardness indicated by other substances than carbonate and hydrogen carbide of calcium and magnesium, such as sulfate, chloride, and nitrate. 7.2 Acronyms, Abbrev
28、iations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to EDS-T-7731 9 Release and Revisions This standard was originated in June 1994. It was first approved by Engineering Standard Committee in June 1994. It was f
29、irst 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 . Q$ : 73L:E8 ?3 -C *,“X38 98(8x ,7t $48 F#
30、 A1 ?3 (CaCO3)8 PPM8p) E4F F . ?3$ : 73L:E8 ?3 (Ca)68x ,7t $48 F# A1?3 (CaCO3)8 PPM8p) E4F F . *,“X3 $ : 73L:E8 *,“X3 (Mg)68x ,7t $48 F# A1?3 (CaCO3)8 PPM8p) E4F F . A170 $ : ?3 *,“X38 A170 -C AG3L270 8F7 E4%L# $ . /xA170 $ : ?3 *,“X38 G170 , 70G,p , :170 &% A170 -C AG3L270 878 7 8F7 E4%L# $ . 7.2 6
31、6 -C dGl . F$-1F 68 . 8 Ed - $* ,l2P! $+ &%72P ., E:48 87%T &# $80 M8 EdF$ . Test to EDS-T-7731 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 ) 3 AUG 2011 Apply new Engineering Standard Template. Limited use with no replacement (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 ($4=E:4 68 ) =* (G)8*4G D4 )
