NM Water Sampling Technician-Level 1 Newest Complete Questions And Correct Detailed

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NM Water Sampling Technician-Level 1 Newest 2025/2026 Complete Questions And Correct Detailed Answers (Verified Answers) |Already Graded A+||Brand New Version!!

T or F: Since fluoride is added to water to help prevent tooth

decay, any amount is always good for me! :D - ANSWER-False.

At higher concentrations, fluoride can create stains on teeth and lead to brittle bones in older individuals

T or F: The average ambient air temperature for the system is

used to determine the optimum dosage for fluoride - ANSWER- True

Turbidity definition and measurement units - ANSWER- Turbidity is clay, silt or mud in the water.Nephelometric Turbidity Units (NTU)

How does turbidity pose a health risk as a contaminant? - ANSWER-Does not represent a health risk by itself, it can shield harmful bacteria from disinfection processes

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What is a Nephelometer/turbidimeter? - ANSWER-The device used to measure NTU's of turbidity in water

T or F: Water is considered to be acid when it has more

hydrogen ions (H+ ) in it than hydroxide ions (OH- ) - ANSWER-True

Water is considered to be_______when there are more hydroxide ions (OH- ) present than hydrogen (H+ ) - ANSWER- alkaline

Chemicals that add hydrogen ions (H+ ) to water: - ANSWER--

hydrochloric acid (HCl) -sulfuric acid (H2SO4) -nitric acid (HNO3) -carbonic acid (H2 CO3)

Chemicals that alkalize--add hydroxide ions (OH-)-- to water: -

ANSWER--Sodium hydroxide (NaOH) -calcium hydroxide (Ca(OH)2) -magnesium hydroxide (Mg(OH)2)

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When is water considered neutral (pH 7)? - ANSWER-When the number of hydrogen ions and hydroxide ions are the same

T or F: on the pH scale, 2 is more alkaline than 12 - ANSWER-

False. Lower numbers are logarithmically more acidic than higher numbers, with 7 being neutral.

T or F: The dissolved oxygen meter must be continually "on" to

remain polarized: - ANSWER-True.

How to ensure a dissolved oxygen meter electrode is

on/continually polarized: - ANSWER--the electrode must be

continuously attached to the meter and the meter must be either plugged into an AC outlet or if battery operated, the battery must be good

What to do if DO meter battery fails or electrode is unplugged: -

ANSWER-DO electrode must be re polarized for an hour before being used to measure a sample

T or F: oxygen is not affected by temperature or pressure -

ANSWER-False. Since oxygen is a gas, it is influenced by the barometric pressure (altitude) and temperature 3 / 4

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What does the membrane of a DO meter do? - ANSWER-allows oxygen to permeate to the electrode where it creates a mill-volts current directly proportional to the DO concentration

T or F: The electrode should be disconnected from the meter

when the membrane is replaced - ANSWER-True

Signs that the DO the membrane has been replaced properly (2):

• ANSWER--no air bubbles beneath the membrane
• the membrane surface should not be wrinkled.

Organic Contaminants source examples: - ANSWER--herbicides

and insecticides that are primarily used in agriculture applications

• organic solvents used in industrial applications
• organic by-products of industrial processes
• chemical by-products from chlorination of drinking water

-Runoff from agricultural spraying or improper application techniques -Industrial discharges, accidental spills and improper disposal of hazardous wastes

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