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 250 of 460

FED-STD-791D

5. MATERIALS

(Unless otherwise indicated, it is intended that all chemicals shall be of reagent

grade and shall conform to the specifications established by the Committee of Analytical

Reagents of the American Chemical Society, where such specifications are available.)

5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The

chemical materials listed in this section must be handled carefully. Federal Test Method

10000, Material Handling Safety Precautions, is a reference which lists all toxic and

hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,

handling and storage precautions, emergency treatment and measures, and spill practices

of each chemical are explained.

5.2 Potassium chlorate (reagent grade) [1,0,2].

5.3 Nitric acid, conc. (reagent grade) [2,0,0].

5.4 Hydrochloric acid, conc. (reagent grade) [3,0,0].

5.5 Ammonium hydroxide, conc. (reagent grade) [u,0,u].

5.6 Methyl orange indicator solution. Dissolve 0.1 g methyl orange crystals

(reagent grade) in 100 mL of distilled water [u,u,u].

5.7 Ammonium acetate solution. Dissolve 605 g of ammonium acetate (reagent

grade) in distilled water and dilute with distilled water to 2 L [u,0,u].

5.8 Glacial acetic acid (reagent grade) [2,2,1].

5.9 Lead acetate solution. Dissolve 20 g of lead acetate, Pb(CH3COO)2 3H2O

(reagent grade) in distilled water, add 20 mL of glacial acetic acid (reagent grade) and

dilute with distilled water to 1 L [u,u,u].

5.10 Tannic acid [0,1,0].

5.11 Tannic acid indicator. Dissolve 0.05 g tannic acid (reagent grade) [0,1,0] in

48 mL of distilled water and add 2 mL of glacial acetic acid (reagent grade) [2,2,1].

5.12 Ammonium nitrate solution. Dissolve 30 g of ammonium nitrate (reagent

grade) in distilled water and dilute with additional distilled water to 1 L [0,1,3].

6. PROCEDURE

6.1 Weigh a moisture- and oil-free sample (See Note l) of powder, 2.6 to 2.8 g,

on an analytical balance to the nearest 0.1 mg and transfer the sample to a 400-mL

beaker.

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