FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

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'�NOTE:This draft dated 15 April 2006' by DasH - Page 249 of 460

FED-STD-791D

Method 3710.1

September 30, 1986

MOLYBDENUM DISULFIDE PURITY

1. SCOPE

1.1 This method is used for determining the purity of molybdenum disulfide

powder.

2. SUMMARY

2.1 This method consists of dissolving the MoS2 in nitric acid and perchloric

acid, removing iron with ammonium hydroxide and precipitating solution with lead

acetate. The purity of MoS2 is determined from the weight of lead molybdate precipitate.

3. SAMPLE SIZE

3.1 10 g of molybdenum disulfide (MoS2) powder.

4. REFERENCES, STANDARDS, AND APPARATUS

4.1 Hot plate.

4.2 Beakers, borosilicate, 400 and 600 mL.

4.3 Pipet, 50 mL.

4.4 Volumetric flask, 500 mL.

4.5 Buret, 50 mL.

4.6 Mechanical stirrer.

4.7 Porcelain crucible.

4.8 Muffle furnace capable of maintaining 550� to 600�C (1,020� to 1,110�F).

4.9 Desiccator.

4.10 Analytical balance.

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