Lead acetate test for hydrogen sulphide in gas. . 83 3\ 33 30 92 34. J 95 37 39 36 98 JCO I Fig. 4.—Effect of concentration of lead acetate solution(Described in Table 4) Hydrogen Sulphide Test 19 Since the paper, even with the 2 per cent solution, holds a largeexcess of lead acetate over that necessary to precipitate the hydro-gen sulphide coming in contact with it, it is not surprising thatlittle difference is to be noted in the sensitivity of the test whendifferent concentrations of lead acetate solution are used, althoughthere seems to be a tendency for the paper treated with the 2per cent
Lead acetate test for hydrogen sulphide in gas. . 83 3\ 33 30 92 34. J 95 37 39 36 98 JCO I Fig. 4.—Effect of concentration of lead acetate solution(Described in Table 4) Hydrogen Sulphide Test 19 Since the paper, even with the 2 per cent solution, holds a largeexcess of lead acetate over that necessary to precipitate the hydro-gen sulphide coming in contact with it, it is not surprising thatlittle difference is to be noted in the sensitivity of the test whendifferent concentrations of lead acetate solution are used, althoughthere seems to be a tendency for the paper treated with the 2per cent solution to be slightly lighter in color than the other two. Dibdin and Grimwood from a comparison of papers soaked invarious strengths of lead salts in solution * * * decided toadopt a paper prepared by moistening with an approximately12 per cent solution of lead acetate. They do not state theirreason for the choice, and the above-described results give nobasis for any preference within the limits investigated. The use of a per cent solution corresponds to
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