Features:
- Fast accurate results
- Designed to resist interference from monochloramines
- Free Chlorine test strips combine a wide range of detection with its
patented Free Chlorine indicator
- Ideal for testing in a food processing environment
- Reagents are impregnated on the test strip pad, and no external
chemicals are needed to perform the test
Specifications:
- Sensitivity: 0, 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.2, 1.5, 2, 2.6, 4, 6
ppm (mg/L)
- Response time: approximately 40 seconds (see temperature compensation
chart)
- Testing temperature range: 32° to
104° F
Supplied with:
- 50 test strips
- Sampling cup
- Temperature compensation chart
- Instructions
The test strip is for compliance testing as described in the
Federal Register (Vol 72, No. 47, Monday, March 12, 2007, p.11204, ITS Method
D99–003). Free Chlorine Water Check can now be treated as an equivalent to other
free chlorine test kits. States will have the discretion to approve their use
per authority at 40 CFR 141.74 (a) (2). The original recommendation letter
(October 2003) from the EPA stated: "We (EPA) believe that the ITS test strips
will provide the regulatory community with a valuable option for monitoring free
chlorine levels in drinking water."
Municipalities now have a rapid, (40 seconds), accurate, and
low–cost option for regulatory compliance monitoring. According to the EPA
letter; "The false positive and false negative rates were below 0–1%. Method
precision and accuracy were characterized in multiple drinking water matrices at
varying chlorine concentrations. For example, the validation studies showed that
free chlorine recovery was approximately 100% and relative standard deviation (RSD)
was generally below 20% for analysis of drinking water samples fortified with
0.1ppm of free chlorine or above; the chlorination level required by National
Primary Drinking Water Regulations is 0.2ppm. Finally, results did not vary
across different lots of ITS test strips."
As an alternative to DPD, Free Chlorine Water Check test
strips avoid the errors inherent to currently available test methods. The
patented design of the strip (US Pat. Nos. 5491094 & 6541369) makes this
possible. All of the reagents needed to perform the test are embedded in a
"solid state" in the reaction area of the aperture. In comparison to DPD, and
according to the manufacturer "the problem with the use of reagent ‘pillows’ is
that while the ‘pillow’ itself contains the precise amount of reagent needed to
accurately test a defined amount of aqueous solution, the reagent from the open
‘pillow’ can come in contact with the operator’s hands, can be spilled, or can
have adulterants or contaminants accidentally added. This creates significant
chance for error. If errors in the amount or condition of reagent occurs the
test results, and the conclusions reached based on those results, are subject to
error. These errors can result in unnecessary, and possibly dangerous, changes
in water processing conditions predicated upon false readings. " |
