The role of ion pairs and ion activity in classification of ground waters for irrigation in Erbil plain

Volume 16 , Issue 1 , October 2014 , Pages 177-188

Authors

¹ Dept. of Soil and Water, College of Agriculture, Erbil

² Polytechnic university, Khabat, Erbil

This study was conducted to investigate the effect of ion pairs and ion activity on

classification of ground waters. The investigation was included chemical analyses of

water of (38) wells, according to Richards (US) classification (1954) the water of (18)

wells having C2S1 class, water of (16) wells having C3S1 class and the water of (4) wells

were not suitable for irrigation since they have C4S1 class. Correcting ion pairs and

ionic activity caused the change of water class of well number (38) from C4S1 to C4S2

class. On the other hand, correcting ion pairs and ion activity caused the change of

water classes of wells number (24, 25 and 27) from moderate class to good class and

has changed water of well number 30 from bad to moderate class, the similar effect of

ion pairs and ion activity noticed in some other classifications.

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