Homework Solution: a) Horvat and co-workers used atomic absorption spectroscopy to determine the…

    a) Horvat and co-workers used atomic absorption spectroscopy to determine the concentration of Hg in coal fly ash.22 Of particular interest to the authors was developing an appropriate procedure for digesting samples and releasing the Hg for analysis. As part of their study they tested several reagents for digesting samples. Their results using HNO3 and using a 1 + 3 mixture of HNO3 and HCl are shown here. All concentrations are given as ppb Hg sample. HNO3: 161 165 160 167 166 1+3 HNO3–HCl: 159 145 140 147 143 156 Determine whether there is a significant difference between these methods at a = 0.05. B)  Mizutani, Yabuki and Asai developed an electrochemical method for analyzing l-malate.27 As part of their study they analyzed a series of beverages using both their method and a standard spectrophotometric procedure based on a clinical kit purchased from Boerhinger Scientific. The following table summarizes their results. All values are in ppm.
    Sample Electrode spectrophotometric
    Apple Juice 1 34 33.4
    Apple Juice 2 22.6 28.4
    Apple Juice 3 29.7 29.5
    Apple Juice 4 24.9 24.8
    Grape Juice 1 17.8 18.3
    Grape Juice 2 14.8 15.4
    Mixed fruit Juice 8.6 8.5
    Mixed fruit Juice 31.4 31.9
    White wine 1 10.8 11.5
    White wine 2 17.3 17.6
    White wine 3 15.7 15.4
    White wine 4 18.4 18.3 Determine whether there is a significant difference between the methods at a = 0.05.

    Expert Answer

    a) Horvat and co-workers used minute parching spectroscopy to enumerate the ardor of Hg in coal vanish ash.22 Of detail profit to the authors was developing an embezzle progress restraint digesting exemplifications and releasing the Hg restraint anatomy. As divorce of their con-over they tested distinct reagents restraint digesting exemplifications. Their results using HNO3 and using a 1 + 3 combination of HNO3 and HCl are shown here. All ardors are attached as ppb Hg exemplification.

    HNO3: 161 165 160 167 166

    1+3 HNO3–HCl: 159 145 140 147 143 156

    Enumerate whether there is a momentous dissent among these arrangements at a = 0.05.

    B)  Mizutani, Yabuki and Asai plain an electrochemical arrangement restraint analyzing l-malate.27 As divorce of their con-over they analyzed a order of beverages using twain their arrangement and a test spectrophotometric progress installed on a clinical kit purchased from Boerhinger Scientific. The subjoined board summarizes their results. All values are in ppm.

    Sample Electrode spectrophotometric Apple Juice 1 34 33.4 Apple Juice 2 22.6 28.4 Apple Juice 3 29.7 29.5 Apple Juice 4 24.9 24.8 Grape Juice 1 17.8 18.3 Grape Juice 2 14.8 15.4 Mixed outcome Juice 8.6 8.5 Mixed outcome Juice 31.4 31.9 White wine 1 10.8 11.5 White wine 2 17.3 17.6 White wine 3 15.7 15.4 White wine 4 18.4 18.3

    Enumerate whether there is a momentous dissent among the arrangements at a = 0.05.

    Expert Apology