KS H ISO 5378-2008 Starches and derived products－Determination of nitrogen content by the Kjeldahl method－Spectrophotometric method《淀粉和淀粉制品 用凯氏法测定氮含量 分光光度法》.pdf

1、 KSKSKSKS KSKSKSK KSKSKS KSKSK KSKS KSK KS KS H ISO 5378 KS H ISO 5378:2008 2008 10 14 http:/www.kats.go.krKS H ISO 5378:2008 : ( ) ( ) KT&G ( ) : (http:/www.standard.go.kr) ： ： 2003 11 5 ： 2008 10 14 2008-0659 ： ： ( 025097266) (http:/www.kats.go.kr). 10 5 , . KS H ISO 5378:2008 Starches and derived

2、 products Determination of nitrogen content by the Kjeldahl method Spectrophotometric method 1978 1 ISO 5378, Starches and derived products Determination of nitrogen content by the Kjeldahl method Spectrophotometric method , . 1 0.025 %(m/m)1) . / . 2 . . ( ) . KS H ISO 1871, KS H ISO 3188, KS L ISO

3、 648, KS L ISO 1042, ISO 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Norminal sizes of openings ISO 1227/Add. 2 Starch, including derivatives and by-products Vocabulary 3 . 1) 0.01 %(m/m) KS H ISO 3188 KS H ISO 5378:2008 2 3.1 . , . , . 4 2) (Nessler reagent) .

4、5 . . 5.1 . 201.84 g/mL96 %(m/m) 5.2 30 %(m/m) , 201.33 g/mL . 5.3 3) . ： 97 g (II), ： 3 g 5.4 , 5.5 0.1 N 5.6 2 . 100 mL (potassium iodide) 70 g (II)mercury(II) iodide 100 g . 1 000 mL 700 mL (potassium hydroxide) 224 g 2) KS H ISO 1871 3) KS H ISO 1871 5.2 KS H ISO 5378:2008 3 . (II)/ . . 2 . . 1

5、. 6 . 6.1 500 mL 800 mL . 6.2 (6.1) 6.3 200 mL (splash head) (6.1) . KS H ISO 1871 . 6.4 100 mL . 6.5 KS L ISO 1042, A . 6.6 KS L ISO 648, A . 6.7 430 nm . 6.8 6.9 ISO 565 0.6 mm . KS H ISO 5378:2008 4 6.10 7 7.1 4) (spatula) . . (6.9) . 7.2 (7.1) 2 g 5 g( m0) 0.001 g (6.1) . , . (7.8) . 7.3 (5.3) 1

6、0 g 20 4 m0 (mL) (5.1) . . ( ) . (6.1 ) (6.2) . . 1 . . 7.4 mL . 50 mL 150 mL ( ) . (6.3) . (5.5) 25 mL (6.5) . (6.3 ) (5.2) 120 mL . . . . 150 mL 20 30 . 4) ( 5 mm) . KS H ISO 5378:2008 5 . . 7.5 5 (5.4) . (6.6) 100 mL (6.4) 50 mL 100 mL (6.4) 50 mL . . (5.6) 1.0 mL . 10 430 nm (6.7) . g . 1 50 mL

7、0 g 240 g(1 000 mL 5 000 g) . 2 2 . 7.6 (6.6) 100 mL 175 g( 25 mL 50 mL) 7.4 (V) . 50 mL . (5.6) 1.0 mL . 10 430 nm (6.7) . 7.7 (7.1) 2 . 7.8 7.4 7.6 50 mL . (7.2 ) 7.3 . 7.9 KS H ISO 1871 . 8 . 02106215015010010150200200mmVmmmVm = KS H ISO 5378:2008 6 m0： (7.2) (g) m1： (7.2) (V mL) (g) m2： 50 mL (g

8、) V ： 7.6 2 . 9 . . . 135513 7017 (02)60094114 (02)600948878 http:/ Korean Agency for Technology and Standards http:/www.kats.go.kr KS H ISO 5378:2008KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Starches and derived products Determination of nitrogen contentby the Kjeldahl method Spectrophotometric method ICS 67.180.20