Water Sampling and Arsenic Reduction Capabilities
Two weeks following the installation of the RO units, ADEQ and Watts Premier returned to the dwellings in order to collect water samples and drop off a survey for homeowners to complete. Results of the sampling and survey are below. In addition to samples collected by ADEQ for lab analysis, on sight water analysis was conducted using colorimetric test kits.
 Two additional samplings were completed in May and September 2004, where ADEQ collected samples for lab analysis. Watts Premier also conducted on sight test kit analysis as well as grab samples for lab analysis in order to provide additional layer of information for the pilot project.
The water parameters that were analyzed were:
- Arsenic
- Alkalinity
- Total Chlorine
- Free chlorine
- Hardness
- Iron
- pH
- TDS
In both communities there was no iron or residual chlorine in the water at the dwellings.
In all sampling that was conducted throughout the life of the project, the RO unit’s reduced 92% alkalinity and 97% of the hardness in the water.
Average arsenic (wet lab test results) and TDS percent reductions for all samples taken at the test sights are as follows
Michael's Ranch |
First Sampling
January 2004
|
Second Sampling
April 2004
|
Third Sampling
August t 2004
|
|
Influent |
Effluent |
Influent |
Effluent |
Influent |
Effluent |
Arsenic |
16 |
N/D* |
16 |
N/D* |
15 |
N/D* |
TDS |
170 |
10 |
190 |
9 |
164 |
7 |
|
|
|
|
|
|
|
Black Canyon City |
First Sampling
January 2004 |
Second Sampling
April 2004 |
Third Sampling
August 2004 |
|
Influent |
Effluent |
Influent |
Effluent |
Influent |
Effluent |
Arsenic |
13 |
N/D* |
12 |
N/D* |
26 |
N/D* |
TDS |
445 |
41 |
391 |
23 |
358 |
25 |
|
|
|
|
|
|
|
* N/D Non Detect
* Reporting limit of 2 ppb.
Part of the test was to determine the applicability of an Arsenic test kit in order to supplement the testing requirements for the POU program. there were a couple test kits evaluated, however in the end only the ITS Arsenic Quick II Test Kit, part number 481303 we found to accurately detect arsenic levels around the regulated levels of 10.0 ppb. This test kit has advertises arsenic detection accuracy at 1, 2, 2.5, 3, 3.5, 4, 5, 6, 7, 10, 12, 14, 20, 30, and 50 ppb, however during the evaluation program, it was determined that the user could easily determine the difference between 1, 3, 7, 10, 12, and 14 ppb. There were no levels over 14 read on any sampling that was conducted by the test kit.
As the results in the table above show, other than one sample point there is a close relationship between the results obtained using the ITS Arsenic Quick II Test Kit and those obtained during wet lab analysis
>> Back to Summary Report
>> Next Page
|
