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- The column efficiency is constant for a column that uses a cons tant eluent composition. What does this say about the peak width of slowly eluting compounds relative to those of rapidly eluting compounds?A new analytical method to detect pollutants (D) in water is being tested. This new method of chemical analysis is important because, if adopted, it could be used to detect three different contaminants-organic pollutants (O), volatile solvents (V), and chlorinated compounds (C)-instead of having to use a single test for each pollutant. The makers of the test claim that it can detect high levels of organic pollutants with 99.7% accuracy, volatile solvents with 99.95% accuracy, and chlorinated components with 89.7% accuracy. If a pollutant is not present, the test does not signal. Samples are prepared for the calibration of the test and 60% of them are contaminated with organic pollutants, 27% with volatile solvents, and 13% with traces of chlorinated compounds. A test sample is selected randomly. (a) What is the probability that the test will signal? (b) If the test signals, what is the probability that chlorinated compounds are present? Note: Use the notations in the brackets to…Define water activity and briefly describe how it can be determined. Why is it difficult for microorganisms to grow at low aw values?
- The amount of phytomenadione contained in a O.2 mL ampoule of 10 * .mg/mL solutionHow many times greater is the H+ concentration in a soil with a pH of 3.0 versus a pH of 6.0?What is the ratio of H+ ions in a soil with a pH of 9.0 versus a soil with a pH of 7.0? (the ratio pH9.0/pH 4.0) Hint: pH is measured on a logarithmic scale, consider this in your calculationThe authors of this paper also tested another minimal media (Media C) which is exactly the same as Media B except that the pH is 7.4 instead of 7.1. Which media components would be different in Media C? For each component that is different, state if will be larger or smaller than the amount in Media B.
- Relate the terms presented in the first column with the information in the second column; i. Temperatureii. face speediii. Relative humidityiv. Transport and storage timev. Exposure time and concentration of pollutants (__) May influence the integrity of the sample;(__) Influence the amount of sample collected(__) Defines the choice between a sampler containing hydrophilic adsorbents or one with hydrophobic adsorbents.(__) Influences the effective length of the diffusion path.(__)Variation in sampling due to its influence on the diffusion coefficient51. The material responsible for white color in soils is? O Calcite O Oxidized iron O Quartz O Sand OMn O Silt ns in the 52 CENUINWhy there is a need for precipitation within the downstream process. Write down the typical agents used in precipitation render the compound of interest insoluble.
- The relative humidity in pore spaces is high in soils in tropical areas but low in desert soils. TRUE ORFALSEI am not sure how to go about illustrating and answering this question: Use a diagram to illustrate how 10^-4, 10^-6 and 10^-8 dilutions in water of the soil suspension in a final volume of 10 mL will be prepared. There are only three tubes available.In the data given, it is all about measuring the concentration of syrup solution using refractometer in different treatments such as sugar dissolved in distilled water, the sugar dissolved in tap water, and sugar dissolved in boiled water. In the data showing the degrees brix of each treatment, explain how to know/ interpret which of the three (3) is better? what are their differences when sugar is added in distilled water, tap water and bioled tap water?