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Data Access Overview

Graphing Water Quality Data

    Directions for Graphing Water      Quality
     Samples of Water Quality Graphs


Pollutant and Water Quality     Information
     Ammonia
     Arsenic
     Benzene
     Dissolved Oxygen
     Fecal Coliform
     Lead
     Mercury
     Methyl-t-betyl Ether
     Nitrates
     pH
     Phosphorus
     Sulfur
     Turbidity & Sedimentation



Water Testing
    ph
     Nitrogen
     Fecal Coliform
     Dissolved Oxygen
     Company Websites

 

How to test for pH

According to the state of North Carolina, a pH within the range of 6.0 to 9.0 is considered normal. However pH levels in healthy waters usually range between 6.2 and 6.8.

Methods

Using indicators
• which are materials that are specifically designed to change color when exposed to different pH values
• the color of a wetted sample paper is matched to a color on a color chard to infer a pH value
• pH paper is available for narrow ranges (3.0 to 5.5) (4.5 - 7.5) (6 – 8) and also wide ranges (1-11)
• pH paper is typically used for preliminary and small volume measuring,

Using a Colorimeter
• the device uses a vial filled with an appropriate volume of sample to which a reagent is added
• as the reagent is added a color change takes place
• the color is then compared to a color wheel or spectral standard to determine the pH value

Colorimeters are much more expensive and also can conduct multiple other tests, if you are looking for the simplest way to test for pH then using paper indicators are the best.

HACH company product numbers for testing pH are below

pH paper indicators
• Product #: 2601300
• Product #: 39133
• Product #: 38533
• Product #: 37333

Colorimeter
• DR/890 Portable Colorimeter (Product #: 4847000)
• DR/850 Portable Colorimeter (Product #: 4845000)
• DR/820 Portable Colorimeter (Product #: 4844000 )