Industrial cobalt acetate (4)

4.

4.

The sample is fed with hydrogen sulfide under ammonia conditions, and all metal ions except alkali metal and alkaline earth metal ions are precipitated by the formation of sulfide

4.

4.

4.

4.

4.

4.

Weigh 2g of the sample (accurate to 0.

Take 50mL of the filtrate in a porcelain crucible with a constant mass, add 0.

4.

The content (X3) of alkali metals and alkaline earth metals expressed in mass percentage is calculated according to formula (4):

In the formula: m ₂ -crucible plus residue mass, g;

m ₁ —The mass of the crucible, g;

m—the mass of the sample, g

4.

Take the arithmetic mean of the two parallel determination results as the determination result

5 Inspection rules

5.
1 This product should be inspected by the quality inspection department of the manufacturer
.
The manufacturer shall ensure that the products manufactured in the factory meet the requirements of this standard and are accompanied by a quality certificate, which includes: the name of the manufacturer, site, product name, grade, net content, batch number or production date and the number of this standard
.

5.
2 Take products of the same quality as a batch, and each batch of products shall not exceed 1000kg
.

5.
3 Determine the number of sampling units according to 6.
6 of GB/T6678-1986
.
Sampling should meet the requirements of Chapter 2 in GB/T6679-1986
.
The sampling volume of each batch shall not be less than 500g
.
Mix the collected samples and put them into two clean and dry ground-mouth bottles, label them, and indicate: manufacturer name, product name, batch number, sampling date, etc.
, one bottle is used for inspection, the other bottle Save for three months for future reference
.

5.
4 The judgment of the test result shall be carried out in accordance with the rounding value comparison method in GB/T1250
.
If one of the indicators in the inspection results does not meet the requirements of this standard, samples should be taken from twice the amount of packaging for re-inspection
.
Even if only one index does not meet the requirements of this standard in the re-inspection result, the whole batch of products is unqualified
.

6 Marking, packaging, transportation and storage

6.
1 The packaging container should be painted with firm and obvious signs, indicating: manufacturer name, product name, product grade, batch number, trademark, production date, and net content
.

6.
2 Industrial cobalt acetate is packed in plastic drums or cardboard drums lined with plastic bags, and the inner plastic bag needs to be tied
.

6.
3 During transportation, it should be lightly loaded and unloaded, avoiding collisions, and preventing sunlight, rain and moisture
.

6.
4 Industrial cobalt acetate should be stored in a cool and ventilated warehouse or shed
.

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