1、 KS D ISO 4937KSKSKSKS SKSKSKS KSKSKS SKSKS KSKS SKS KS KS D ISO 4937 : 2002 (2007 ) 2002 10 30 http:/www.kats.go.kr . ICS 77.080.01 KS D ISO 4937 2002 Steel and iron Determination of chromium content Potentiometric or visual titration method 1986 1 ISO 4937 Steel and iron Determination of chromium
2、content Potentiometric or visual titration method . . 0.25 35 %(m/m) . , 3 mg . . . ISO 377 Wrought steel Selection and preparation of samples and test pieces ISO 385 1 Laboratory glassware Burettes Part 1 : General requirements ISO 648 Laboratory glassware One-mark pipettes ISO 1042 Laboratory glas
3、sware One-mark volumetric flasks ISO 5725 Precision of test methods Determination of repeatability and reproducibility by inter-laboratory tests . (IV) . (VII) . (II) (VI) . , (II) . , (II) . , , . D ISO 4937 2002 2 1+1 . 1+10 . 1+1 . 1+5 . 1+19 . . . 1 . 100 mL 3.2 g . 2 . . ( ) 250 mL 600 mL 10 .
4、105 (COONa) 2 0.300 0 g 0.000 1 g . ( ) . 25 35 mL/min 39 40 mL . 45 . 70 75 . . , ( ) 250 mL . (c 2 )(mg Cr/mL) . ) V V ( . . . c 0 1 2 700 6 733 1 0 300 = V 1 ( ) (mL) V 0 ( ) ( ) (mL) 6.700 20 1.733 ( ) 1mL (VI) (mg) 300.0 (mg) . 1mL 2mg . (II)(6 ) 46 g 500 mL . ( ) 110 mL D ISO 4937 2002 3 . 1 0
5、00 mL . . ( ) 30.0 mL 600 mL . ( ) 45 mL 450 mL . . (II) ( ) (c 1 )(mg Cr/mL) . V c 2 11.733 30.0 = V 2 (II) ( ) (mL) 30. 0 ( ) (mL) 1.733 ( ) 1 mL (mg) . (II) ( ) 25.0 mL ( ) 325 mL . ( ) . , ( ) 25 mL ( ) 325 mL . (II)( ) (c 1 )(mg Cr/mL) . 25.0 0 3 2 1 V V c c = c 2 ( ) (mg Cr/mL) V 3 (II) ( ) 25
6、 mL ( ) (mL) V 0 ( ) ( ) (mL) 25.0 (II) ( ) (mL) 150 4.903 1 g 0.000 1 g . 1 000 mL . . 1 mL Cr 1.733 mg . ( ) . . ISO 385 1, ISO 648 ISO 1042 A . ISO 377 . , . D ISO 4937 2002 4 (m) 0.000 1 g . 0.25 2 %(m/m) , m 2 g 2 10 %(m/m) , m 1 g 10 25 %(m/m) , m 0.5 g 25 35 %(m/m) , m 0.25 g , , . ( ) 600 mL
7、 . ( ) 60 mL ( ) 10 mL ( ) 1.5 mL . 100 mL . ( ) ( ). ( ) 600 mL . ( ) 25 mL ( ) 15 mL . ( ) 1 2 mL ( ) 20 mL ( ) 10 mL . . ( ) 15 mL ( ). 100 mL ( ). ( ) 600 mL . ( ) 25 mL ( ) 20 mL ( ) 10 mL . ( ) 1 2 mL . ( ) 15 mL . ( ) 15 mL ( .). 100 mL ( ). ( ) 750 mL . ( ) 20 mL, ( ) 10 mL ( ) 1mL . ( ) 30
8、mL . ( ) . 30 mL 5 ( ). 600 mL ( ) 20 mL, ( ) 10 mL 70 mL . ( ) . 350 mL ( ) 20 mL ( ) 10 mL . 10 ( ). ( ) 15 mL , 3 1 ( ). 10 ( ). . D ISO 4937 2002 5 ( ) ( ) . , . . , ( ) 5 mL . ( .) ( ) . ( ) , 10 ( ) 4 mL . 3 . ( ) ( ) . (II) ( ) ( ). . mL V 4 . 300 mV , 700 900 mV . 40 mg 20 mL , 40 mg 50 mL . . . V 5 (mL) . ( ) . ( ) . 100 0 116 0 mV 1 ( ) . 2 . ( ) 10 mL . ( ) 3 g . 800 mV , . 770 mV ( ) 1 . ( ) 5 mL ( 780 mV). ( ) 30 mL . V 6 (mL) . , ( ) ( ) . ( ) ( ) 5 mL 5 . V 7 (mL) . ( ) ( ) . ( .) . V 8 (mL) . D ISO 4937 2002 6 ( ) 2 . 5 . 3 mg . (Cr) %(m/m) . (V 4 V 0 ) c 1( V 4 V 0 ) c 1
