Assignment No. 3 (Due 8:30 Am, Tuesday February ,2003)

Mecag 309

Assignment No. 3 (Due 8:30 am, Tuesday February ,2003)

1. a)Convert the following concentrations to mg/L:

Ion Concentration (meq/L)

Mg2+ 15.5

Ca2+ 20.5

+ NH4 7.2

Cl- 44

2- SO4 71.4

Fe3+ 1.5

Fe2+ 1.5

Pb2+ 0.7

b)What is the hardness of the sample in mg/L of calcium carbonate?

2. Using the attached table:

a) Convert the chemical concentrations from mg/l to meq/l (Note that hardness and alkalinity are in equivalent CaCO3 concentrations)

b) Do a charge balance by comparing the sum of the cations and anions (in meq/l)

c) Express the concentration of the cations and anions as percentages of the total cation or anion concentration.

d) Plot these percentages on a blank copy of the piper plot provided at the end of this file. Use some method of representing the TDS of each sample (size or colour of plotted point). e) If groundwater represented by samples #3 and #4 were to mix in proportions of 2 parts #4 to 1 part #3 what would be the final chemistry of the water? Plot this point on your piper plot as well.

f) Calculate the total hardness(mg/l) of CaC03, and the concentration of (Na+K) in mmoles/l for the lake water (Sample F), if the ionic strength of this water is 40 eq/l. 3.What is the SAR of the following solutions? Ion Solution 1 Solution2 Solution 3 Concentrations Concentrations Concentrations (mg/L) (mg/L) (mg/L) - NO3 - 50 - Mg2+ 15 200 50 + NH4 -N - 12 1500 Cl- 150 300 1000 -2 SO4 500 1500 1800 Ca+2 25 250 100 Na+ 120 300 500 K+ 17 34 1200 - HCO3 1000 2500 7000

4. If an irrigation system is used to apply a mixture of Solution 1 and Solution 3 so that 125lb nitrogen per acre and 3500m3 liquid per ha is applied, a) How many m3/ha of each solution is required? b) What is the SAR of the mixture?

5. Compare Canadian Drinking Water Guidelines with those of another country. Note any differences. Why do you think the reason for any differences might be? Sample # Odour pH Cond. TDS Cations Fe Mn Na K Total Hardness Cl NO3 (mmhos/cm.) (mg./l.) (mg./l.) (mg./l.) (mg./l.) (mg./l.) (mg./l.) (mg./l.) 1 Nil 7.45 2160 1620 33.172 0.15 0.46 140 7.2 1040 14.0 1.6 2 Nil 9.15 1450 1087.5 26.265 0 0 198 40 400 15.0 0.4 3 Nil 7.25 4800 3600 105.6 0 0.07 1120 6.4 400 35.0 1.7 4 Nil 7.25 4400 3300 65.68 0.3 0.37 300 14.4 1960 20.0 0.7 5 Nil 7.6 2660 1995 35.656 0 0.11 100 5.6 1340 10.0 12.0

Sample # CO3 Alkalinity (mg./l.) SO4 (mg./l.) 1 Nil 533.0 805.9 2 Nil 544.0 320.5 3 Nil 564.0 1993.3 4 Nil 568.0 1985.4 5 Nil 360.0 1144.1