sulfur determination in thioacetamide is shown in Table I. The average results from three determinations of hydrolyzable sulfur appear in Table 11. The total sulfur was known from the composition. For compounds which cannot be obtained in a pure state, total sulfur was found by analysis. I t can be seen from Table I1 that the hydrolyzable sulfur of the compounds listed is equal to their total sulfur content, except for ammonium dithiocarbamate which decomposes according to the reaction SHICSS-
+ 2 OHCSS-
+ S-’+ 2 HzO
The method described in this paper
can be applied for such conipounds as rubianic acid, rhodanine. cystine, organic aiid inorganic polysulfides, and organic thiocyanate. Reliable results can be obtained when o-hydroxymercuribenzoic acid solution is standardized under the conditions of the determination. In some cases-e.g., polysulfide-the course of hydrolysis depends on o-hydroxymmxribenaoic acid and sodium hydroside concentration. For the determination of such compounds the calibration curve giving the consumption of o-hytlrosymercuribenzoic acid as a function of quantity of the compound tinder the conditions of determination may be recommended. This method can be applied to the rapid determination of wool (Table 111).
The sample containing less than 180 nig. of wool, dried at 105” C., is heated with 10 nil. of 0.04-V o-hydrosymercuribenzoic acid, 5 1111. of 1N sodium hydroside, and 25 nil. of m-ater for 15 minutes. and the excess of o-hydrolymercuribenzoic acid is backtitrated n i t h thioglycolic acid as described a h o w . LITERATURE CITED
(1) W-roriski, >I., l n d y s t 83, 314-5 (1908). ( 2 ) Wroriski, SI.,Zeszyly .\-a,tk. C., r n i v . Lodz 11, XO.4 , 181-93 11958). ~IIECZY‘T x w \TRO
