Apparatus for Determination of Sulfur by
the Evolution Method R. STEVENS GIBBS
AND
FREDERICK B. CLARDY, Chemical Laboratory, United States Navy Yard, Portsmouth, Va.
I
port an asbestos (Transite) shelf 8.75 em. (3.5 inches) wide, 41.25 em. (16.5 inches) long, and 0.6 cm. (0.25 inrh) thick, on which the 300-ml. Pyrex tall-form absorbing beakers rest. The special Kjeldahl bulb is connected to the absorbing beakers by a bent delivery tube of 6-mm. bore Pyrex glass, with one end restricted to an opening of 2 mm.
N THE course of years many advantages in determining sulfur b y the evolution method (1) have been brought to the attention of this laboratory. Consequently an arrangement of apparatus has been evolved, which m a y be of help t o new laboratories and offer a fen. advantages t o others. Figure 1 shows the completely arranged apparatus and Figure 2 chows the detail arrangement.
The arrangement is very compact. T h e chemist is able to run ten determinations per set and having three sets a s shown, can run thirty determinations simultaneously. T h e addition of one or more sets, without taxing the table, permits forty or fifty determinations t o be made at one time. The hydrochloric acid and 11-ater for dilution are readily accessible above the table, enabling the chemist to facilitate their addition, as well as speed up the work. After the evolution is completed, the delirery tubes are separated from the connecting bulbs and the absorbing beakers are left on the shelves until titrated. B y the use of ammoniacal zinc sulfate solution, diluted to a volume of 150 ml., the need of a hood is obviated.
Literature Cited (1) Am. SOC. Testing Materials, Method E30-3CiT, p. 24.
Determination of Sulfide Sulfur in Alkaline Solutions Containing Other Sulfur Compounds
FIGURE 1. ARRAXGEMENT OF APPARATUS The Pvolution flask is a 300-ml. narrow-mouthed Pyrex ErlPnmeyer flask, into which is inserted a two-hole sulfur-free rubber stopper, a special Kjeldahl type of connecting bulb, and a thistle tube. The I
