Industrial isobutane (HC-600a) (3)

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The moisture in the sample reacts quantitatively with the iodine and sulfur dioxide in the electrolyte as follows:

H ₂ O+I ₂ +SO ₂ →SO ₃ +2HI

2I ^- → the I ₂ + 2E

The number of iodine molecules participating in the reaction is equal to the number of water molecules, and the iodine produced by electrolysis is proportional to the amount of electricity consumed.

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The electrolyte (commercially available reagent) matched with the coulometric moisture meter

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Add electrolyte, adjust the coulometric moisture meter, perform pre-titration, make the electrolytic cell reach an anhydrous state and prepare for sample injection analysis

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The mass fraction of water w ₃ , the value is expressed in %, calculated according to formula (3):

Where:

m ₀ -the value of the mass of water in the sample, in grams (g);

m ₁ —The value of the mass of the sampled cylinder and sample before sampling, in grams (g);

m ₂ —The value of the mass of the sampled cylinder and sample after injection, in grams (g)

Take the arithmetic average of the two parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.
0003%
.

4.
3.
2 Electrolysis

According to the provisions of GB/T10670
.

4.
4 Acidity determination

Carry out according to the regulations in 2.
3 of GB/T7373-1987
.

Take the arithmetic mean of the two parallel determination results as the determination result, and the relative deviation of the two parallel determination results shall not exceed 40%
.

Related Links: Industrial Isobutane (HC-600a) (2)