Homework Answers
The laboratory will report the nitrate concentration as milligrams per liter (mg/L) or as parts per million (ppm) (1 mg/L = 1 ppm).
Most laboratories report nitrate as nitrate-nitrogen (NO3-N), which is the amount of nitrogen in the nitrate form. Some labs may report total nitrate (NO3-).
For your understanding, you can compare both as:
10 mg/L nitrate-nitrogen (NO3-N) = 44.3 mg/L nitrate
(NO3-) in drinking water.
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The drinking water standard for nitrate is 10 mg/L as N (i.e., drinking waters should not...
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The Safe Drinking Water Quality Standard for nitrate nitrogen (NO3--N) is 10.0 mg/L. Convert this into nitrate (NO3-) in ppm, mmol/L, and normality (N). (Given: N=14, O=16) The highest maximum one-hour ozone (O3; molecular weight = 48) concentration in Houston during 1999-2001 was 175 ppb. Convert this into mg/m3 at STP. The National Ambient Air Quality Standards for 1-hr O3 is 155 mg/m3. (Given: mg/m3 = ppm*MW/22.4).
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The maximum allowed nitrite (NO2-) in drinking water is listed as 1 mg/L; for nitrate (NO3-) it is 10 mg/L. The standard half-cell potential for the nitrate <-> nitrite reaction is Eo = 0.881 V. What is the pE of a water body whose pH is 5.4 that is just at the limits of allowed nitrite and nitrate?
1. Chloroform (CHCl3) has a Drinking Water standard concentration of 0.10 mg/L . a. What is...
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2) The EPA has determined that the maximum safe level of nitrate ion in water is...
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The drinking water standard for tetrachloroethylene is 0.005 mg/L. The potency factor for tetrachloroethylene is 5.1*10^-2(mg/kg-day)-1....
The drinking water standard for tetrachloroethylene is 0.005 mg/L. The potency factor for tetrachloroethylene is 5.1*10^-2(mg/kg-day)-1. What lifetime risk would this pose? Assume 30 year exposure for 350 days per year
Chloroform (CHCI3) has a Drinking Water standard concentration of 0.10 mg/L What is this concentration expressed as par...
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Q.3 The drinking water standard for 2,3,7,8-TCDD (dioxin) is 3×10-8 mg/L. Using EPA exposure factors for...
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A water sample has 5 mg/L of Nitrate, 10 mg/L of Potassium, 60 mg/L of Calcium,...
A water sample has 5 mg/L of Nitrate, 10 mg/L of Potassium, 60 mg/L of Calcium, and 60 mg/L of Magnesium. If the alkalinity is 394 mg/L of CaCO3, calculate the Total Hardness, Carbonate Hardness, and Noncarbonate Hardness using all polyvalent cations.
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2) The EPA has determined that the maximum safe level of nitrate ion in water is 10 ppm. Suppose a sample of tap water was determined to have a nitrate ion concentration of 95 ppb. Assume the density of water is 1.00 g/mL a) What is the concentration of nitrate ion in units of ppm? Is it safe to drink? b) What is the concentration of nitrate ion in units of mg/ml? c) What mass of nitrate ion is in...
Chloroform (CHCI3) has a Drinking Water standard concentration of 0.10 mg/L What is this concentration expressed as parts per million (ppm)? Typical consumption Risk Analysis L/day for 70 years. How many grams of CHCI3 would the average human 1. a. b. assumes the average human drinks 2.2 during a lifetime at the Drinking Water standard concentration? consume Find the Volume of 1 mole of an ideal gas at 1.2 atm and 80°C 2. The Air Quality Standard for sulfur dioxide...
20/27OBLEM: Suppose drinking water contains 1 mg/l of toluene and 0.01 mg/l of tetrachloroethylene (C2C4). A 70 kg adult drinks 2 t/day of this water for 10 years. a) Assess HR and evaluate HR. Was this a safe level of exposure? b) C2C4 is a carcinogen. What would be the carcinogenic risk faced by a person drinking it. Would it be less than 106 (goal)? RfDtoluene 0.2 mg/kg.day RfDc:ci 0.0 mg/kg.day PFc.c 5.1 x 10-2 (mg/kg-day)
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Nitrate cant excede 94,3 mg/l methemoglobinemia. Three rural wells were sampled and the report reads th concentrations as the following: Well ID Nitrate (in mg-N/L) #1 0.01 #2 1.3 #3 20 a) Convert well water readings to mg-NO3/L. b) Does any of the wells exceed the regulatory limit?
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