Toxicity of TCDD in Animal Based Foods
Given that the average TEQ of animal-based foods is about 0.7 picograms of TCDD equivalent per gram, and that the LD50 for 2,3,7,8-TCDD is about 0.001 mg/kg body weight, what mass(kg) of animal-based food would you have to consume to ingest a fatal dose of it?
Could you please explain what formula and step are involved and please provide (example) problem if possible: A 40.0 mL sample of river water was titrated with 0.0010 M Na2Cr2O7 and required 8.3 mL to reach the end-point. What is the chemical oxygen demand, in milligrams of O2 per liter, of the sample?
Steady State Radon Concentration in the Basement of a House
Radioactive radon gas (222Rn) enters an average building at a rate of 4 picocuries per second per square meter of foundation area. Consider a house with a foundation of 200 square meters and a volume of 1000 cubic meters. Assume the house if well designed for energy conservation so that the ventilation rate is low and only one t ...continues
a)Assume a wind turbine with a hub 50 meters above the ground, a rotor diameter of 75 meters and a wind-conversion efficiency of 25 percent. The turbine operates in an area with an average wind-power density of 650 watts/sq meter at 50 meters altitude. How much electricity (kwH) can the turbine generate per year? b) Wind de ...continues
What technology or combination of technologies would you recommend for treating Sulfur dioxide contaminated air streams? Could you include a brief description of the recommended technology so I can understand:
Work, Power and Enerhgy: Wind Turbines
Could you please explain what formula and step are involved and please provide (example) problem if possible? a)Assume a wind turbine with a hub 50 meters above the ground, a rotor diameter of 75 meters and a wind-conversion efficiency of 25 percent. The turbine operates in an area with an average wind-power density of 650 wa ...continues
What technology or combination of technologies would you recommend for treating the following contaminated air streams? Include a brief description of the recommended technology: (a) 0.05 to 20 micron particulates along with 800 ppmv of chlorinated solvent
An industrial facility used an open paved storage yard to stage Polychlorinated biphenyl (PCB)-containing transformers removed from its facilities for 30 years. The yard is bounded by workshops on the north, highway 32 on the west, a creek on east and south. Several leaks and spills in the storage yard have been documented by an ...continues
Calculating amount of H3PO4 to reduce pH of wastewater
Wastewater flow is 1.5 million gallons per day. The pH of the incoming wastewater is 5.2 The desire is to use 30% H3PO4 to reduce the pH of the wastewater to pH 2.5. How would I calculate the amount of 30% H3PO4 needed to accomplish this pH change for the 1.5 MGD wastewater flow??? Please show me your calculations.
How much of a 0.95 M potassium hydroxide solution do you need to neutralize 39.69 ml of a 0.825 M phosphoric acid solution? (in liter)
