Q: The following data are the vanadium content of samples of Canadian granite
The following data are the vanadium content of samples of Canadian granite (Ahrens, 1954). Determine the geometric mean and geometric standard deviation from this data set.
See AnswerQ: An adult consuming 100 micrograms a day of a substance whose steady
An adult consuming 100 micrograms a day of a substance whose steady-state level in the body is later established to be 0.1 mg • kg−1 . Estimate the biological half-life t1/2 for elimination of this su...
See AnswerQ: In 1996, the U.S. EPA developed a new
In 1996, the U.S. EPA developed a new reference dose for methylmercury CH3Hg+: Rf D = 0.1 mg • kg−1 • day−1. Estimate the amount of fish a 60 kg woman can safely eat each week if the average CH3Hg+ c...
See AnswerQ: According to a 1992 survey, the drinking water in one-
According to a 1992 survey, the drinking water in one-third of Chicago homes had lead levels of 10 ppb. Identify the most sensitive receptor (resident child or resident adult) and calculate the lead a...
See AnswerQ: Mackay (1982) reports a linear correlation between the bio-
Mackay (1982) reports a linear correlation between the bio-concentration factor BCF of organic compounds in fish and the octanol-water partition coefficients Ko−◦...
See AnswerQ: The U.S. EPA PBT Profiler (cf. Appendix
The U.S. EPA PBT Profiler (cf. Appendix D, Chapter 8, Surface Chemistry and Adsorption) tabulates selected environmental properties for a broad range of organic compounds. Among the tabulated environm...
See AnswerQ: The U.S. EPA PBT Profiler (cf. Appendix
The U.S. EPA PBT Profiler (cf. Appendix D, Chapter 8, Surface Chemistry and Adsorption) tabulates selected environmental properties for a broad range of organic compounds. Identify the toxicological...
See AnswerQ: An adult Bengali has been drinking water from a tube wells in
An adult Bengali has been drinking water from a tube wells in Lalpur, Nadia District, Bangladesh installed 35 years ago. The well water contains cw = 17 mg • dm−3 total dissolved arsenic. Select an a...
See AnswerQ: The lung cancer incremental excess lifetime cancer risk ILECR is estimated to
The lung cancer incremental excess lifetime cancer risk ILECR is estimated to be 10−4 resulting from chronic 222Rn(g) exposure at a level of 10 mBq dm−3. The ILECR...
See AnswerQ: The exposure factor Ei,j for the shrew—the US
The exposure factor Ei,j for the shrew—the US EPA mammalian insectivore test specie—is given by the first expression below. The U.S. EPA wildlife risk model ass...
See Answer
