No.

Lists of reference materials/certified reference materials

Manufacturer

 Supplier

1

521 Nitrosamines calibration standard

Restek Corporation (USA)

CE Combination Co.Ltd. (Thailand)

2

Nitrosamines mixture

Ultra Scientific (USA)

Power Tech Chemical Industry Co., Ltd. (Thailand)

3

N-Nitrosomorpholine

AccuStandard, Inc. (USA)

Dr.Ehrenstorfer GmbH (Germany)

Saengvith Science Co., Ltd. (Thailand)

S.M. Chemical Supplies Co., Ltd. (Thailand)

 

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