Water monitoring
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Created by:
Summer0682 on May 1, 2012
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26 terms
Terms | Definitions |
|---|---|
 Water testing begins with an assessment of the water system and developing a sampling which should include? | Diagram the components of the portable water system. ID portable contamination events. Establish water consumption requirements-20 gallon per person per day. Determine potential impacts of water shortfalls. ID facilities and resources that could cause shortfalls. ID workaround. |
| Chlorine added to water system is? | Means of purification. Sampling should be done weekly to insure level chlorine is maintained by IDMT or water plant personnel on site. |
| What are six major variables affect the efficiency of chlorine disinfection? | Types/concentrations of chlorine. pH of water. Concentration of substances that exert chlorine demand. Length of time of contact of the organisms with the chlorine. Temperature of the water influences the rate of reaction of chlorine compounds. Rate organisms are killed. Types and density of the organisms ie viruses, protozoa, helmets,present resistance to chlorine. |
| How do you do chlorine residual testing? | Open tap and let water run for a few movements. Rinse test tube in water to be tested. Fill to mark on tube. Add one DPD tablet. Cap and shake gently to completely dissolve tablet. Place tube in comparator, read results within one minute. |
| What should the fixed facility chlorine residual testing be? | Reading of 0.2 ppm acceptable for bactericidal level |
| What should the field conditions chlorine residual testing be? | 10ppm acceptable for cystocidal level |
| Record results of chlorine residual testing on? | DD Form 686, fluoride/bacteriological examination of water |
| All tx water should contain? | A trace of residual chlorine at all times in distribution systems under constant circulation. |
| Bactericidal levels are routinely used since? | Waterborne bacteria are likely to be the most prevalent organisms. Locations- fixed AF base, locations where sanitation is not suspect. |
| Cystocidal levels are mainted as? | Outlined in AFI 48-119, medical service environmental quality program. Locations include substandard facilities, foreign locations where sanitary deficiencies are known or suspect. |
| To test pH level in water what are the steps? | Collect water at the same time as the chlorine residual. Rinse test tube with water to be tested. Fill to Mark on tube. add one phenol red pH tablet. Cap and shake gently to the dissolve tablet. Place tube in comparator read results within one minutes. Acceptable range six - nine fixed facilities. Record results on DD form 686 |
| Biological quality of drinking water is collected for? | Potential for transmitting waterborne diseases. by viruses, bacteria, protozoa or higher organisms. |
| Bacterial logical test determines what? | Presence of coliform bacteria, and any fecal contamination is considered unsafe. |
| Only samples for drinking and culinary purposes are used to evaluate portability , principal use area is? | Dining facilities, dispensaries/aid station, dormitory's, administrative area. |
| Samples will not be collected from where? | Hot water faucet, mixing faucets, fire hydrant, leaking fixtures, drinking fountains, hoses, dead end sections of distribution system |
| Sample rate for bacteriological water samples is? | 2 per week |
| What is the action of the colilert test? | It utilizes nutrient indicators that produce and/or flourescence when metabolism by total coliforms and ecoli. When reagent is added to sample and incubated it can detect small levels within 24hrs, |
| Store colilert tests kits in? | A cool 39° to 86°F, place away from light |
| What is the procedure for accomplishing the colilert test? | Open tap and let water run for a few minutes. Close tap and clean with alcohol prep pads. Re-open tap and produce small stream of water. Detained the chlorine residual and record the value. Fill to 100ml line. Do not contaminate inside of bottle or cap. Within 1 hr of collection, if longer than one hour refrigerate until procedure can be done. Extensive changes in Bactria floral may occur if not examined within 30hrs. Setup incubator, ensure correct voltage is used temp should be 35C. Tap the snack pack to ensure that all the colilert powder is in the bottom part of the pack. Open one pack by snapping back the top at the score line. Caution: do not touch the opening of the pack. Add reagent to the water sample, replace the cap On the bottle being careful not to touch inside cap Or bottle. Be sure cap is on tight. Shake bottle until reagent is dissolved. |
| Incubate water sample test for colilert for how long? | 24 hours at 35°C. Read results at 24 hours, compare each result against the comparator dispensed into an identical bottle. If no yellow color is observed, the test is negative |
| If the sample has a yellow color equal to or greater than the comparator, the presence of? | Coliforms is confirmed. If the color is not uniform mix by ivnersion then recheck. If the sample is yellow, but later than the comparator, it may be incubated an additional four hours. But no more than 28hrs total. If the sample is positive, the color will intensify. If it does not intensify, the sample is negative |
| Give yellow is observed during colilert testing check the bottle for? | Florescent by placing a UV light within 5 inches of the sample in a dark environment; be sure the light is facing away from your eyes and towards the bottle. If florescence is greater or equal to the florescence of the comparator, the presence of E. coli is confirmed. When the sample remains clear, negative results are indicated; no coliforms or E. coli are present |
| Yellow color after 28 hours is? | Not a valid test and should be repeated or verify |
| Some water samples humic material may have? | An innate color. If a water sample has some background color compare inoculated colilert sample to control blank of the same water sample. |
| Use sterile water, not buffered water for making dilutions,colilert is? | Already buffered always add colilert to the proper volume of diluted sample after making dilutions. |
| Colilert is ? | Primary water test; performance characteristics do not apply to samples altered by any pre-enrichment or concentration |
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