Aug. 18,1923 
Sulphur Compounds in Dry Lime-Sulphur 
335 
to 20 0 C. was added until a volume of 535 cc. resulted. The flask was 
immediately corked and sealed with paraffin, leaving but a very small 
air space. The flask was then allowed to stand at room temperature 
with shaking for 48 hours, after which the deposited sulphur was rapidly 
transferred, by forced filtration, to a platinum Gooch crucible with a 
thin asbestos pad, thoroughly washed, dried for one hour at ioo° C., and 
the crucible and contents weighed, ignited, and reweighed to obtain the 
amount of sulphur. 
Fig. 2. Diagram showing variations in percentage of undissolved sulphur due to chemical equilibrium 
resulting from the hydrolysis of lime-sulphur compounds in aqueous solutions. 
SUMMARY 
(1) The three forms of sulphur, monosulphid, residual, and thiosulphate 
sulphur, contained in lime-sulphur powders may be easily and accurately 
determined by the passage of C 0 2 through a solution of the polysulphid. 
The accuracy of the method is based upon the fact that C0 2 separates 
quantitatively the monosulphid sulphur from the thiosulphate and 
residual sulphur. The use of this method allows for a complete separa¬ 
tion of the residual from the thiosulphate sulphur, thus enabling accurate 
estimation of both. 
(2) The method is entirely free from any laborious process of filtering 
and uncertainty regarding end-points in the use of indicators. 
(3) The application of this method eliminates all errors due to hydrol¬ 
ysis of lime-sulphur compounds in aqueous solutions and also the 
reacting influences of C 0 2 and O of the atmosphere. 
