Table 2. Major Ion Composition of Lake Van Water in the Deep Basin for July 1974, June 1990, and May and September 2005a


Date	Na+ (mg L-1)	K+ (mg L-1)	Ca2+ (mg L-1)	Mg2+ (mg L-1)	Cl- (mg L-1)	SO42- (mg L-1)	HCO3- (mg L-1)	CO32- (mg L-1)	Salinity (g kg-1)

July 1974

   Mean water column	7747	508	5-10	94.8	5450	2344	2191	3331	21.3

June 1990 (stations 27-28/90)b

   Mean water column	7912	430	3.8	110	5812	2408	3149	1717	21.2
   Mean hypolimnion	7972	433	3.6	110	5871	2435	3306	1773	21.5

May 2005

   Mean water column	8177	425	<10	112	6104	2526	2310	1439	20.7
   Mean hypolimnion	8209	428	<10	112	6144	2537	2314	1442	20.8

September 2005

   Mean water column	7452	485	<10	119	6322	2763	2691	1680	21.2
   Mean hypolimnion	7511	488	<10	120	6191	2778	2696	1683	21.1

aData for July 1974 were taken from Kempe [1977] and data for June 1990 were from Reimer et al. [1992]. Mean values for the hypolimnion were calculated for the depth interval between 100 m and lake bottom on the basis of chemical data of one water profile for each date.
bFrom Reimer et al. [1992].