Various Potassium salts (0.5 M K2SO4, 1 M KCl and M CH3 COOK) were tested for the extraction of inorganic nitrogen (NH4, NO3 & NO2-N) from coal mine soils. Although the amount of NH4-N extracted by various extractants was significantly different, there was no regular increase/decrease in the levels of NH4-N extracted by the various salt solutions. The amount of NO3-N extracted by KCl was significantly more compared to K2SO4 or CH3COOK which was attributed to the Cl ions interference in the colorimetric determination of NO3-N. The K2SO4 salt solution did not interfere and was, therefore, recommended to be used as an extractant for the colorimetric determination of soil inorganic nitrogen.
MUSHK I ALAM ,M Q KHAN ,S H SHAH ,S H SHAH ,MUSHK I ALAM ,
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