Q.3 The drinking water standard for 2,3,7,8-TCDD (dioxin) is 3×10-8 mg/L. Using EPA exposure factors for...
Q.3 The drinking water standard for 2,3,7,8-TCDD (dioxin) is 3×10-8 mg/L. Using EPA exposure factors for residential consumption, what lifetime risk would this pose? Note that the potency factor of dioxin is 1.56×105 mg/kg-d.
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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...
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
1. The drinking water standard for tetrachloroethylene is 0.005 mg/L, The potency factor for tetrachloroethylene is...
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. 2. •Suppose a 70-kg man is exposed to 0.1 mg/m3 o etrachloroethylene in the air at his workplace. If he inhales 1m3/hr, 8 hours per day, 5 days per week, 50 weeks per year, for 30 years, and if tetrachloroethylene has an absorption factor of 90 percent...
A 70-kg individual drinks 2 L/day of water containing 0.015 mg/L of tetrachloroethylene for 20 years....
A 70-kg individual drinks 2 L/day of water containing 0.015 mg/L of tetrachloroethylene for 20 years. (a) Find the hazard quotient for this exposure. (b) Find the cancer risk. (c) If the individual drinks this water for 30 years instead of just 20, recomputed the hazard quotient and the cancer risk. A man works in an Aluminum smelter for 10 years. The drinking water in the smelter contains 0.015 mg/L arsenic and 0.80 mg/L methylene chloride. His only exposure to...
1. Chloroform (CHCl3) has a Drinking Water standard concentration of 0.10 mg/L . a. What is...
1. Chloroform (CHCl3) has a Drinking Water standard concentration of 0.10 mg/L . a. What is this concentration expressed as parts per million (ppm)? b. Typical consumption Risk Analysis assumes the average human drinks 2.2 L/day for 70 years. How many grams of CHCl3 would the average human consume during a lifetime at the Drinking Water standard concentration? 2. The Air Quality Standard for sulfur dioxide (SO2) is 0.04 ppm. Express this as mg/m3 at 1 atm and 25oC.
Chronic dally irve. It can also be FIGURE 4.10 The potency factor is the slope of...
Chronic dally irve. It can also be FIGURE 4.10 The potency factor is the slope of the dose-response curve. It thought of as the risk that corresponds to a chronic daily intake of 1 mg/kg-da Potency Factory Inhalation Row (mg/kg-dayi 50 2.9 x 10-2 6.11 6.1 8.1 x 10-2 - 41 TABLE 4.9 Toxicity Data for Selected Potential Carcinogens Potency Factor Oral Route Category (mg/kg-day) Chemical 1.75 Arsenic 2.9 X 10-2 Benzene 11.5 Benzol(a)pyrene Cadmium 0.13 Carbon tetrachloride 6.1 X...
Chloroform (CHCI3) has a Drinking Water standard concentration of 0.10 mg/L What is this concentration expressed as par...
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...
QUESTION 3 The textbook discusses 3 types of environmental degradation affecting the environment. Below, please match...
QUESTION 3 The textbook discusses 3 types of environmental degradation affecting the environment. Below, please match each type of degradation discussed to the type of consequence suggested in the textbook. (Answer based on what the book says, not based on your personal opinion.) Air pollution A., is killinig humans 8,..isklin the earth Land poliution Water pollution address chiticar Watel Air Pollution Air pollution occurs when the release of materials to the atmosphere cannot be safelv disposed of by natural processes....
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...
All of the following questions are in relation to the following journal article which is available...
All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...
A 70-kg individual drinks 2 L/day of water containing 0.015 mg/L of tetrachloroethylene for 20 years. (a) Find the hazard quotient for this exposure. (b) Find the cancer risk. (c) If the individual drinks this water for 30 years instead of just 20, recomputed the hazard quotient and the cancer risk. A man works in an Aluminum smelter for 10 years. The drinking water in the smelter contains 0.015 mg/L arsenic and 0.80 mg/L methylene chloride. His only exposure to...
Chronic dally irve. It can also be FIGURE 4.10 The potency factor is the slope of the dose-response curve. It thought of as the risk that corresponds to a chronic daily intake of 1 mg/kg-da Potency Factory Inhalation Row (mg/kg-dayi 50 2.9 x 10-2 6.11 6.1 8.1 x 10-2 - 41 TABLE 4.9 Toxicity Data for Selected Potential Carcinogens Potency Factor Oral Route Category (mg/kg-day) Chemical 1.75 Arsenic 2.9 X 10-2 Benzene 11.5 Benzol(a)pyrene Cadmium 0.13 Carbon tetrachloride 6.1 X...
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...
QUESTION 3 The textbook discusses 3 types of environmental degradation affecting the environment. Below, please match each type of degradation discussed to the type of consequence suggested in the textbook. (Answer based on what the book says, not based on your personal opinion.) Air pollution A., is killinig humans 8,..isklin the earth Land poliution Water pollution address chiticar Watel Air Pollution Air pollution occurs when the release of materials to the atmosphere cannot be safelv disposed of by natural processes....
All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...
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