The mol a r extinction coeffi ci ents for p-nitropheno 1 at pHs in the region of 8.0-9.2 in the presence and absence of various additives were determined. The data were statistically analysed. The validity and reproduci bil ity of these values were di scussed. The study reveals that pH has a considerable effect on molar extinction coefficient values. These values are however not influenced by such additives like cetyltrimethyl ammonium bromide (CTAB). various strengths of carbonate-bicarbonate buffer and potassium bromide at the same pH.
A E BEG ,
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