This set of activities is for extra points
Can I shower in lead-contaminated water?
Yes. Bathing and showering should be safe for you and your children, even if the water contains lead over EPA’s action level. Human skin does not absorb lead in water.
This information applies to most situations and to a large majority of the population, but individual circumstances may vary. Some situations, such as cases involving highly corrosive water, may require additional recommendations or more stringent actions. Your local water authority is always your first source for testing and identifying lead contamination in your tap water. Many public water authorities have websites that include data on drinking water quality, including results of lead testing. Links to such data can be found on the EPA Consumer Confidence Report website.
For more information, see CDC's "Sources of Lead: Water" Web page.
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ACTIVITY: The Video Visit to the Water Testing Lab
1460 West McNab Road, Fort Lauderdale
(1) What does the lady say about TRI HALO METHANES and HALO ACIDS?
(2) What is the cost of the Lead test?
ANSWERS: ______ ($28 per sample)
1 mg/L = 1 ppm.
1 mg/L = 1 ppm.
The Water Testing at Florida Spectrum
(4) Why does the company call itself "Florida Spectrum Environmental"?
(5) How many samples did the company test?
HINT: THE RANK OF THE LAST TEST SAMPLE IS HOW MUCH? ______
(6) What is the RANGE of numbers? (The lowest to the highest)
(a) LOWEST:
(b) HIGHEST:
(c) What is the 90th Percent of these 34 numbers?
HINT: Not the highest, not the middle, not the lowest...
A small amount of nitric acid is at the bottom. Fill up the bottle with water. The bottles don't need ice.
Don't get the acid on you. It will bring the pH down to level 2.
Why? Lead sticks to the side of a plastic bottle if the water is not acidic.
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ANSWERS
(6) What is the RANGE of numbers? (The lowest to the highest)
(a) LOWEST: ANSWER 0.00008
(b) HIGHEST: ANSWER 0.0014
(c) What is the 90th Percent of these 34 numbers?
HINT: Not the highest, not the middle, not the lowest...
HINT: Not the highest, not the middle, not the lowest...
Not the highest, not the middle, not the lowest...
The lowest is 0.00008 milligrams per liter
The highest is 0.0014 milligrams per liter
ANSWER: The 100th Percent is the highest number.
The 90th percent is above the middle
0 --------25-----------50----------75--------90-----100
| | |
LOWEST X HIGHEST
0.00008 | 0.0014
|
|
0.0010 is the 90th percent
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one milligram in 1 liter is 1 part per million
This is the same as grams per 1,000 liters, which may be converted to milligrams per liter (mg/L). Therefore, 1 g/ m3 = 1 mg/L = 1 ppm. Likewise, one milligram per cubic meter (mg/m3) is the same concentration in water as one microgram per liter(ug/L), which is about 1 ppb.
1 milligram per liter = 1000 micrograms per liter
0.0014 mg per liter x 1000 micrograms/liter = 1.4 micrograms per liter
0.0014 mg per liter x 1000 micrograms/liter = 1.4 micrograms per liter
one microgram per liter(ug/L), which is about 1 ppb.
0.00140 high 1.40 parts in 1 billion
0.00008 low 0.08 parts in 1 billion
CONCLUSION:
CONCLUSION:
EXTRA INFORMATION
(If you want to know more, you can look below this RED LINE
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Highlights
Feb. 25: Tests Show High Lead Levels In Home
A city test "reveals high lead content in the water of a Flint resident's home." As Michigan Radio reported, the water at Lee Anne Walters' home "turns up with a lead content of 104 parts per billion. Fifteen parts per billion is the [Environmental Protection Agency]'s limit for lead in drinking water."
In April, Walters says her child was diagnosed with lead poisoning. An independent test done by Virginia Tech researchers finds lead levels at 13,200 ppb — water is considered hazardous waste at 5,000 ppb.
Oct. 13: General Motors Stops Using Flint River water
General Motors says it will stop using Flint River water, fearing corrosion in its machines. "Because of all the metal ... you don't want the higher chlorine water (to result in) corrosion," GM spokesman Tom Wickham tells MLive. "We noticed it some time ago (and) the discussions have been going on for some time."
(1) What does the lady say about TRI HALO METHANES and HALO ACIDS?
In the video she explains:
It starts with ascorbic acid to take the chlorine out of the solution (minute 0:46) Then Hydrochloric acid is added to hold the trihalomethane in solution. It expands the "hold time" from one day to 14 days with acid.
At 1:30 the camera guy says "the methane tries to leave the solution."
(2) What is the cost of the Lead test?
ANSWERS: ($28 per sample)
1 mg/L = 1 ppm.
The Water Testing at Florida Spectrum
(3) What is a Spectrum?
ANSWER: see the WIKIPEDIA answer
(4) Why does the company call itself "Florida Spectrum Environmental"?
ANSWER: a spectrum is from 0 to infinity, from a low number to a high number, from little to big. "We test many items" could be another way of saying, "We have a full spectrum of options."
(5) How many samples did the company test?
HINT: THE RANK OF THE LAST TEST SAMPLE IS HOW MUCH? ______ ANSWER: 34
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