Assignment No. 3 (Due 8:30 Am, Tuesday February ,2003)
Mecag 309
Assignment No. 3 (Due 8:30 am, Tuesday February ,2003)
- a)Convert the following concentrations to mg/L:
Ion / Concentration (meq/L)
Mg2+ / 15.5
Ca2+ / 20.5
NH4+ / 7.2
Cl- / 44
SO42- / 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 Concentrations (mg/L) / Solution2 Concentrations (mg/L) / Solution 3 Concentrations (mg/L)NO3- / - / 50 / -
Mg2+ / 15 / 200 / 50
NH4+-N / - / 12 / 1500
Cl- / 150 / 300 / 1000
SO4-2 / 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. (mmhos/cm.) / TDS / Cations / Fe (mg./l.) / Mn (mg./l.) / Na (mg./l.) / K (mg./l.) / Total Hardness (mg./l.) / Cl (mg./l.) / NO3 (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