# Chromium is sometimes measured in abnormal concentrations near heavily traveled roads due to its…

Chromium is sometimes measured in abnormal concentrations near heavily traveled roads due to its…
Chromium is sometimes measured in abnormal concentrations near heavily traveled roads due to its presence in petroleum products (e.g., gasoline, oil, tires).                    An LIBS system was mounted on the back of a truck to sample roadside soils along Highway 73 in Texas. Prior to departure, a standard sample of 10.00 mg∙kg–1 Cr in clean soil was sampled using the truck-mounted system, giving a mean reading and standard deviation of 17.32 ± 0.13 mA for ten readings. The truck then sampled
View complete question » Chromium is sometimes measured in abnormal concentrations near heavily traveled roads due to its presence in petroleum products (e.g., gasoline, oil, tires).                    An LIBS system was mounted on the back of a truck to sample roadside soils along Highway 73 in Texas. Prior to departure, a standard sample of 10.00 mg∙kg–1 Cr in clean soil was sampled using the truck-mounted system, giving a mean reading and standard deviation of 17.32 ± 0.13 mA for ten readings. The truck then sampled roadside soil along the highway at six locations, each measurement representing a single reading. The locations given in the table are GPS longitude/latitude designations; you can use “loc: N29.826° W94.368°” in Google to find that location on a map. (a) Estimate the concentration of chromium in the soil at each location. (b) Is the Cr in the soil at the third location (N29.826°, W94.250°) significantly (statistically speaking) above the standard sample? (c) Rationalize the trend(s) you see in the data. (d) How accurate would you say the data are? How many significant figures do you believe you can reasonably assign to the calculated concentrations? Explain your rationale. (e) What would you do to achieve greater accuracy in the concentration of Cr in roadside soils? View less »Dec 08 2021 01:38 PM

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