# Calculate Selenium Conc. in Phoenix Tap Water (mg/L)

• apbuiii
In summary, the concentration of phosphate in Phoenix tap water is 7.3 ppm (mass based) and there is no information given about the concentration of selenium. It is possible that the question was a typo and meant to ask for the concentration of phosphate in mg/L.
apbuiii

## Homework Statement

Suppose the concentration of phosphate in Phoenix tap water is 7.3 ppm (mass based), then what is the concentration of selenium in milligrams per liter? The density of water is 1 g/mL.

## Homework Equations

Phosphate: PO4-3; 7.3 parts/million

## The Attempt at a Solution

I honestly have no idea how to start. They want concentration of selenium but there is no mention of it from the information stem. Maybe it's just a typo and they mean concentration of phosphate in mg/L. Anyways, please guide me in the right direction. Thanks!

There is some piece of information missing, no way this can be solved as worded.

Well, there is a slight chance that there was some additional information buried in the text outside of the question, stating that ratio of both in typical drinking water is almost constant or something like that. But I don't think that's the case.

--

Yeah... it was a typo by the professor. Haha. Thanks anyways though!

## 1. How do you calculate the selenium concentration in Phoenix tap water?

To calculate the selenium concentration in Phoenix tap water, you will need to collect a sample of the tap water and analyze it using a method such as inductively coupled plasma mass spectrometry (ICP-MS). This method measures the amount of selenium present in the water and provides a concentration in milligrams per liter (mg/L).

## 2. What is the recommended limit for selenium in drinking water?

The recommended limit for selenium in drinking water is 50 micrograms per liter (µg/L) or 0.05 mg/L, as set by the US Environmental Protection Agency (EPA). This limit is based on the potential health risks associated with consuming high levels of selenium.

## 3. What factors can affect the selenium concentration in tap water?

The selenium concentration in tap water can be affected by a number of factors, including the source of the water (e.g. groundwater vs. surface water), the geology and soil composition of the area, and any nearby industrial or agricultural activities that may contribute to selenium contamination.

## 4. How does the selenium concentration in Phoenix tap water compare to other cities?

The selenium concentration in tap water can vary greatly between different cities and regions. However, according to the latest data from the EPA, the average selenium concentration in Phoenix tap water is below the recommended limit of 0.05 mg/L. This is consistent with other major cities in the United States.

## 5. Can high levels of selenium in tap water be harmful to human health?

Yes, high levels of selenium in tap water can be harmful to human health. Long-term exposure to high levels of selenium has been linked to health issues such as hair and nail loss, skin lesions, and neurological disorders. It is important to monitor and regulate the selenium concentration in tap water to ensure it remains below the recommended limit to protect public health.

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