Stormwater collected during a storm has the following characteristics. Draw an i

Question

Stormwater collected during a storm has the following characteristics. Draw an ion bar chart and calculate the following:

Total hardness in mg/L as CaCO_3 Carbonate hardness in mg/L as CaCO3 Non-carbonate hardness in mg/L as CaCO_3 Alkalinity in mg/L as CaCO_3 A 100 mL water sample is collected and placed in a drying dish (m = 0.5000 g) then placed in an oven at 104*C until all moisture is evaporated. The mass of the dish is then recorded as 0.5625 g. Another 100 mL sample is filtered and the liquid that passes through the filter is collected and placed in another drying dish (m = 0.5000 g) then placed in an oven at 104 degree C until all moisture is evaporated. The mass of this dish is then recorded as 0.5325 g. The filter (dry mass = 0.2000 g) is collected and placed in a furnace at 550 degree C. After combustion, the mass of the filter and residue is 0.2090 g. Calculate: Total solids Total dissolved solids Volatile suspended solids

Explanation / Answer

1) Total Hardness =calcium hardness+ magnesium hardness

Calcium Hardness =92 * 100/40 = 230ppm

Magnsium Hardness = 26 *100/24 = 108ppm

total Hardness = 338ppm

2) carbonate hardness = conc of bi carbonate

= 410*100/51

=803ppm

3) non carbonate hardness

chloride ion= 1.4 *100/35.5=3.94ppm

sulphate ion = 2*100/96= 2.08ppm

nitrate is 0 ppm

4) alkalinity =803ppm

5) Total soilds = 0.0625*1000/100=625ppm

6)Total disolved solids = 0.0325*1000/100=325ppm

7)volatile suspended particles =total undisolved - fixed suspended particles

= 300-209

= 91ppm

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