Hydro-geochemical Investigation and Quality Assessment of Groundwater for Drinking and Agricultural Use in Jawaharlal Nehru University (JNU), New Delhi, India - Management of Natural Resources in a Changing Environment - page 7

Table 1 Range of chemical parameters in groundwater of Jawaharlal Nehru University campus

Sample number exceeding
permissiblelimitsofWHO
( 1993 )

Maximum
permissible
limitsofWHO
( 1993 ) (mg/l)

Concentrations(mg/l)

Pre-monsoon Post-monsoon

Parameters Range Mean Range Mean Pre- monsoon Post- monsoon Undesirable effect

pH 6.9-7.5 7.2 6.7-7.7 7.2 9.2 - - Taste

TDS 207-1002 526 260-965 489 1500 - - -

Ca 2+ 29.03-112 63.46 39.36-93.3 64.08 200 - - Scale formation

Mg 2+ 7.26-13.25 8.95 6.77-20.22 12.84 150 - - -

Na + 36.20-281 125.44 39.40-249 106.65 200 2 2 High blood pressure

K + 0.10-6.90 2.54 0.10-5.90 2.18 12 - - Bitter taste

Fe 0.02-0.44 0.12 0.02-0.17 0.09 0.3 6 - Promotes iron bacteria

HCO 3 − 176-420 307 224-376 288 800 - - -

SO 4 2− 24.4-68.11 47.57 28.58-61.35 47.00 400 - - Laxativeeffect

Cl − 1-462 130.27 2.0-452 118.55 600 - - Salty taste

F − 0.40-2.0 0.90 0.70-2.00 1.08 1.5 6,8 6,8 Dental and skeletal luorosis

PO 4 3− 0.05-0.56 0.30 0.02-0.07 0.04 - - - -

TH 119-334 208 73-224 172 500 - - Scale formation

pCO 2 (atm) 3.7 × 10 −3 -7.4 × 10 −2 1.9 × 10 −2 6.8 × 10 −3 -5.6 × 10 −2 2.2 × 10 −2 - - - -