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276
REES AND ANDERSON
September
An addition of 2.00 grams per liter of hydroquinone was made to the original sodium hydroquinone monosulf onate solution and the absorption curve determined before and after extraction, as shown in curves C and D of Fig. 3. These curves show that hydroquinone was extracted quantitatively in the presence of sodium hydroquinone monosulf onate.
To study the effect of quinhydrone and compounds formed by interaction of quinhydrone with other compounds in a developer, a mix was prepared containing 2.00 grams per liter of quinhydrone and no Elon or hydroquinone. The absorption data are shown for the solution before and after extraction in curves A and B in Fig. 4. One gram
i per liter of hydroquinone was added
to the water layer after the above extraction. The resulting spectrophotometric curve is curve C in Fig. 4 and is noted to be virtually the same as curve A (which was obtained from a sample containing 2.00 grams of the quinhydrone). The close similarity of curves A and C can be explained by the splitting of quinhydrone into hydroquinone and another product, which appears to be quinone, which is not extracted. Extraction of solution C (curve C) resulted in curve D, which is noted to be nearly identical with curve B,
260 300
avelength m
Fig. 4 — Extraction study with quinhydrone and hydroquinone.
A , quinhydrone.
B, solution A after extraction.
C, solution B with hydroquinone added.
D, solution C after extraction.
showing that the added hydroquinone was extracted.
To study the effects of quinone, a mix was prepared containing 2.00 grams per liter of quinone and no Elon or hydroquinone. The absorption curve of this mix before and after extraction with ethyl acetate is shown in curves A and B, Fig. 5. The change in absorbancy and curve shape is considered to be due to the presence of some quinhydrone as an impurity in the quinone. The addition of 2.00 grams per liter of hydroquinone and subsequent extraction is shown by curves C and D, Fig. 5. It is noted that the extraction of the hydroquinone was virtually complete.
To check on the extraction of Elon monosulfonate, a mix was prepared containing 1.18 grams per liter of Elon monosulf onic acid and