How do you test lead levels in water to give a quantitate result, not just whether lead is preasent or not? Where do you get lead testing equipment? Provide an equipment list, a list of chemicals and method. Note we have a colormeter at college.© BrainMass Inc. brainmass.com October 16, 2018, 4:04 pm ad1c9bdddf
A test for Lead levels in water
A method of analysis that can be used to test lead levels in water is inductively coupled plasma mass spectrometry (ICP-MS), a new and powerful method of analyzing samples for trace metals, including lead.
ICP-MS is the method of choice for the determination of lead in surface water, ground water, and effluents. ICP-MS is now recognized and is gaining complete acceptance by most regulatory agencies. Methods are fully described under US EPA 200.8. Click on the link 600R94111 Methods for the Determination of Metals in Environmental Samples, Supplement 1 and a very detailed report is given on this method.
The ICP-MS instrument consists of a conventional ICP torch (mounted horizontally rather than vertically) with the usual sample uptake and nebulizing devices. ...
A method of analysis that can be used to test lead levels in water is inductively coupled plasma mass spectrometry (ICP-MS), a new and powerful method of analyzing samples for trace metals, including lead. Using ICP-MS, scientists are able to analyze a large number of elements, including lead, simultaneously to detection levels that are lower than those established for the analysis of drinking water. This group includes essentially all elements of environmental concern and is applicable to most waters, effluents and leachates. Lead is able to be detected as low as 0.1 micrograms / Liter of water. 475 words.
1. Assume that the demand for bottled water is price inelastic. Are the following statements true or false? Explain.
a. When the price of bottled water decreases, the quantity sold increases.
b. The percentage change in the price of bottled water is less than the percentage change in quantity demanded.
c. Changes in the price of bottled water do not affect the number of bottled water sales.
d. Quantity demanded is non responsive to changes in price.
e. If more bottled water is sold, expenditures on bottled water will increase.
f. At this point the marginal revenue of bottled water is negative.
2. A manufacturer of computer workstations gathered average monthly sales figures from its 56 branch offices and dealerships across the country and estimated the following demand for its product:
Q = 24,750 - 4.6 P + 255A + 0.48Ppc + 0.56 Pm + 0.38 Pc
(8,688) (2.1) (296) (0.2) (0.29) (0.22)
The number in parenthesis indicates the standard errors of the parameters. The variables and their assumed values are:
Price of basic model
Advertising expenditure (in thousands)
Average price of a personal computer
Average price of a microcomputer
Average price of a leading competitor's workstation
a. Compute the elasticities for each of the variables. On this basis, discuss the relative impact that each variable has on the demand. What implications do these results have for the firm's marketing and pricing policies
b. Conduct a t-test for the statistical significance of each variable; state whether a one- tail test or two-tail test is required. What difference, if any, does it make to use a one-tail versus a two-tail test on the results? Discuss the results of the t-tests in light of the policy implications mentioned.
c. Suppose a manager evaluating these results suggests that interest rates and the performance of the computer (typically measured in millions of instructions per second, or MIPS) are important determinants of the demand for workstations and must therefore be included in the study. How would you respond to this suggestion? Elaborate.