Other than salinity, what other parameters can a refractometer measure? How is it different from salinity? What other instruments can be used to measure salinity?
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- Other than salinity, what other parameters can a refractometer measure? How is it different from salinity? What other instruments can be used to measure salinity?
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- The nurse notes the patient's IV pump is set at 12 mL/hr. The IV bag holds 20 units of Pitocin mixed in 500. mL of Lactated Ringers. How many mu/min is the patient receiving. Note that mu is milliunits. 6mu/min 48 mu/min 12 mu/min 0.48 mu/min 8 mu/min(b) Table Q1 below provides optical measurements of samples with known concentrations of analyte (ten samples were measured and the average and standard deviation are presented). They are also represented graphically in Figure Q1, below the table. Analyte concentration (nM) 0.1 0.2 0.5 1 2 5 10 15 fluorescence intensity 300000 250000 200000 150000 100000 50000 0 0 Table Q1 Fluorescence intensity (average) 9300 9200 10800 19600 37200 90000 178000 224000 5 [Analyte]/nM 10 Standard deviation 2000 1200 1000 2000 10000 30000 25000 40000 15 Figure Q1. Signal intensity for different analyte concentrations. Error bars are standard deviation. (ii) Calculate the limit of detection (LOD) for this sensor. (iii) A patient sample measured using this biosensor in the diagnostic laboratory generates a signal of 142800. The coefficient of variation of the device is 5%. Explain whether the diagnostic lab would have the confidence to report that the sample has a concentration in analyte of 8 nM or…What is the reason for the decrease in the ABS value over time when measuring in the spectrophotometer?
- In a spectrophotometer, what should be the appearance on the graph if the sample is pure? presence of salt and protein?Why can we use drops instead of concentration to graph the data? What do we have to do experimentally to ensure reliable data? In other words, what equipment do we need to use to make sure the only thing changing is the concentration of bleach.Given the following absorbance spectrum, to what wavelength should you set the spectrophotometer to measure your samples? Absorbance 400 500 600 Wavelength (nm) 700
- The pH probe/meter uses following equations: Ecell = L + 0.0592 log a1 = L - 0.0592 pH Where L = L1 + EAg/AgCI + Easy= constants L1 = - 0.0592 log a2 a1 = activity of analyte solution a2 = activity of internal solution How will measured pH value be affected vs “real” pH if the temperature of the sample is 30C when pH was measured ? a.measured pH is lower than real pH b.impact can not be determined c.measured pH is higher than real pH d.measured pH is same as real pHWhy is it that a warm cuvette does not lose any significant heat during the absorbance measurement or during the transfer to the spectrophotometer?A 46.60-gram pycnometer was filled with 100.50 grams of liquid. When filled with insoluble powder, the pycnometer weighs 84.60 grams. When the insoluble powder and liquid were combined, the pycnometer weighed 172.8 grams. What is the relative density of the insoluble powder?
- It is possible to make a perfectly precise measurement?Explain.How does the results of the pH meter and the pH paper compare with each other?Which of the following statements are true about the use of a blank in spectrophotometry? Select all that apply. Select 2 correct answer(s) A blank is needed because the spectrophotometer also measures the absorbance of the cuvette and water. A blank must be measured prior to measuring your sample. None of the answer choices listed are correct. A blank must be measured after measuring your sample. A blank is only needed when the concentration of your sample is known.