Reflectometry apparatus and method
a reflectometer and apparatus technology, applied in the field of reflectometers and colorimetric analysis, can solve the problems of inconsistent or inaccurate apparatus, limited analytical applicability, and contamination of reflectometer optics, and achieve the effect of facilitating appropriate positioning of test strip apertures
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example 1
Total Chlorine
[0052]100 ml deionized water standards at 23 degrees C. are prepared containing 0 ppm, 0.05 ppm, 0.08 ppm, 0.13 ppm and 0.18 ppm total chlorine, as measured by the Hach DPD method.
[0053]An embodiment of the test strip of FIG. 1 is commercially available under the trademark Ultra Low Total Chlorine. This test strip provides visual color-matching for 0, 0.01, 0.02, 0.05, 0.1, 0.15 and 0.2 ppm total chlorine, and includes a thermoplastic support having a nominal width of 8 mm, length of 72 mm, and thickness of 0.01 inches (0.25 mm). Translucent matrix 64 has a nominal width of 8 mm, length of ½ inches, and thickness of 0.4 mm. Auxiliary pad 74 has a nominal width of 8 mm, one inch length, and thickness of 0.62 mm. The colorimetric indicator is TMK. The auxiliary pad is a potassium iodide-bearing pad.
[0054]A wavelength of 525 nm is used. White surface 52 of the test strip holder channel is used for blanking, that is, obtain a baseline reading, before a measurement.
[0055]Fo...
example 2
Total Chlorine
[0059]20 ml deionized water standards are prepared at room temperature containing the levels of total chlorine shown in Table 2. The levels of total chlorine are determined using the Hach DPD method.
[0060]An embodiment of the test strip of FIG. 4 is marketed under the trademark E-Z Check Sensitive TC. This test strip provides visual color-matching for 0, 0.1, 0.5 and 4 ppm total chlorine, and includes a PVC support having a nominal width of 8 mm, length of 72 mm, and thickness of 0.25 mm. The translucent matrix has a nominal width of 8 mm, length of ½ inches, and thickness of 0.34 mm, and is more dense than the Example 1 test strip. TMK and potassium iodide are used for color development.
[0061]Using E-Z Check Sensitive TC test strips, the procedure of Example 1 is followed, except that a 10 second contact time (with a reduced number of strokes) and 30 second wait time are used. Each run is repeated once. The results (White, % R) are shown in Table 2. Average values are...
example 3
Free Chlorine
[0064]50 ml deionized water standards are prepared at room temperature containing the levels of free chlorine shown in Table 3. The levels of free chlorine are determined using the Hach DPD method.
[0065]Another embodiment of the test strip of FIG. 4 is commercially available under the trademark SenSafe® Free Chlorine Water Check from Industrial Test Systems, Inc., Rock Hill, S.C. This test strip has a visual color-matching range of 0 to 4.0 and more than 6.0 for free chlorine, and includes a thermoplastic support having a nominal width of 8 mm, length of 72 mm, and thickness of 0.25 mm. The translucent matrix has a nominal width of 8 mm, length of ½ inches, and thickness of 0.4 mm. The colorimetric indicator is TMB.
[0066]Using SenSafe® Free Chlorine Water Check test strips, the procedure of Example 1 is followed, with each run being repeated once. The results (White, % R) are shown in Table 3.
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