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Sanitation Standard for Nitrous Oxide to be used in Food
1.中華民國九十四年二月十八日行政院衛生署衛署食字第 0940400816 號 令訂定發布全文 4 條；並自發布日施行 2.中華民國一百零二年八月二十日衛生福利部部授食字第 1021350146 號 令修正發布第 1 條條文 3.中華民國一百零九年七月一日衛生福利部衛授食字第 1091301119 號令 發布廢止
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This Standard is prescribed in accordance with the provisions of Article 17 of the Act Governing Food Sanitation.
The name of the chemical is indicated as nitrous oxide, dinitrogenmonoxide or nitrogen oxide; the formula of the chemical is indicated as N2O, and its molecular weight is 44.01.
1Nitrous oxide to be used in food shall meet the requirements according to the following standards and tests：
2┌───────────┬──────────────────┐
3│Item │Standards and tests │
4├───────────┼──────────────────┤
5│Assay │Not less than 97% (v/v) │
6├───────────┼──────────────────┤
7│Description │Colourless, odourless gas │
8├───────────┼──────────────────┤
9│Solubility │1 volume dissolves in 1.5 volumes of│
10│ │water (20℃, 760 mm Hg) │
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This Standard shall be implemented from the date of promulgation.
12│Flame test │A glowing splinter of wood in │
13│ │contact with nitrous oxide bursts │
14│ │into flame (distinction from │
15│ │nitrogen). │
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17│Pyrogallol test │Collect about 100 mL of the gas │
18│ │under test in a 100-mL tube fitted │
19│ │at the top with a stopcock. Open the│
20│ │stopcock, and quickly add a freshly │
21│ │prepared solution of 500 mg of │
22│ │pyrogallol in 2 mL of water and a │
23│ │freshly prepared solution of 12 g of│
24│ │potassium hydroxide in 8 mL of │
25│ │water. Immediately close the │
26│ │stopcock and mix. The gas is not │
27│ │absorbed and the solution does not │
28│ │become brown(distinction from │
29│ │oxygen). │
30├───────────┼──────────────────┤
31│Carbon monoxide │Not more than 10 μL/L │
32├───────────┼──────────────────┤
33│Nitric oxide and │Not more than 5 μL/L │
34│nitrogen dioxide │ │
35├───────────┼──────────────────┤
36│Halogens and hydrogen │Not more than 5 μL/L │
37│sulfide │ │
38├───────────┼──────────────────┤
39│Arsine and phosphine │Pass 10.0 L at a rate of 1.0 L/min │
40│ │through a glass tube packed with │
41│ │lead acetate TS on cotton wool and a│
42│ │gas distribution head of the domed, │
43│ │sintered type, of porosity 100, into│
44│ │a tube of about 2.5 cm internal │
45│ │diameter, containing 5 mL of Silver │
46│ │DDC/Quinoline TS, the domed head │
47│ │being almost in contact with the │
48│ │bottom of the tube. The colour of │
49│ │the Silver DDC/Quinoline TS is not │
50│ │changed. │
51│ │ │
52│ │Silver DDC/Quinoline TS: Dissolve 50│
53│ │mg of finely powdered silver nitrate│
54│ │in 100 mL of quinoline and add 0.2 g│
55│ │of silver diethyldithiocarbamate. │
56│ │The reagent should be freshly │
57│ │prepared. │
58└───────────┴──────────────────┘