Buchi KjelSampler K-377 Manual do Utilizador descarregar pdf (Página 29)

3 Technical data

K-375/376/377 Operation Manual, Version B

3.5 Reference substances

Table 3-18: Reference substances

Name Purity % N theoretical

(100 % purity)

Recommended

sample size

Recommended titrant concentration Digestion necessary

Ammonium

dihydrogen

phosphate

99.5 12.18 0.2 g c(H2SO4) = 0.1 mol/L No

Glycine 99.7 18.66 0.2 g c(H

2SO4) = 0.1 mol/L Yes

Phenylalanine 99.0 8.47 0.3 g c(H2SO4) = 0.1 mol/L Yes

Ammonium

sulfate

99.5 21.21 0.2 g c(H2SO4) = 0.1 mol/L No

Tryptophan 99.0 13.72 0.2 g c(H

2SO4) = 0.1 mol/L Yes

Acetanilide 99.0 10.36 0.2 g c(H2SO4) = 0.1 mol/L Yes

3.6 Materials used

3.6.1 Titrator module and dosing unit

Table 3-19: Materials on the titrator

part Material designation

Housing sheet steel

NOTE

For the materials of the Dosing Unit, please refer to its manual which is delivered together with

dosing unit.

3.6.2 K-375

Table 3-20: Material on the K-375

Part Material Material code

Housing Polyurethane PUR/UL VO

Glass parts Borosilicate glass 3.3 DIN/ISO 3585

Insulation steam generator Ceramic ﬁber Multitherm 550

Steam generator housing Stainless steel 1.4301

Protective door Polymethyl methacrylate PMMA

Seal ring Chlorosulfonyl polyethylene elastomer CSM

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 159 160

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