pH Paper and other Test Strips
Single-use test materials used to rapidly and semi-qualitatively determine the acidity or alkalinity of liquids or to measure another parameter or substance; may include tests for starch, chlorine, and molybdenum; usually via the use of color-based reactions.
pH Papers, pH strips, pH sticks, and pH test kits are used in laboratory, industrial, and educational environments to qualitatively assess pH levels or monitor acid-base titrations in a range of sample types.pH Buffer reference standards are used for the accurate calibration of pH meters and monitors for far more precise and quantitative pH measurement.
pH Test papers are supplied either as rolls, tear-off strips, or sticks. They are impregnated with indicator dyes that change color at a specific pH. In some products, indicator dyes are covalently linked to cellulose fibers to avoid bleed-out (leaching) and contamination of the test sample.
Some pH papers indicate simple acid or base conditions with a single red-to-blue color change (also called litmus papers). Universal pH papers and strips contain a combination of indicators that cover a range of pH values up to and including 0 to 14 in a single test. The observed color change is checked against a comparison chart supplied with the papers.
Alternatively, for metered assessments of pH, standard or reference pH buffers are used to calibrate pH meters and other electrochemical sensors.
Standard Buffer Characteristics:
• Typically supplied at fixed values of pH 4.01, pH 7.00, and pH 10.01
• May be color-coded for easy and quick identification
• Certified to their nominal pH and accuracy at a specified temperature (typically 20°C)
• Supplied as ready-to-use solutions or concentrates
• Contain antifungals for extended shelf life
Electron Microscopy Sciences Pehanon pH Indicator Strips 3.8-5.5, 0.2/0.3 gradations
pH indicator papers where the indicator and color scale are combined on a single strip. They permit a fast, convenient, and accurate pH determination since it is not necessity to compare color against a scale. This presentation also permits the pH measurement of colored solutions and suspensions, since the color of the test solution acts on the comparison scale in the same manner as on the indicator field.
The indicator zone (unprinted field) is in the center of the strip, the comparison fields above and below same. The strip is submerged in the solution for three seconds so that all colors zone are wetted and the center field changes color according to the pH value of the solution. It is then compared to the color filed bearing the corresponding pH value imprint. An invisible hydrophobic barrier just above the top color field prevents capillary action of the test solution.
pH: 3.8-5.5
Gradations: 0.2/0.3
CTL Scientific Supply Corp PH INDICATOR STRIPS 0.0-6.0
pH-Fix indicator strips pH 0.0-6.0 (non-bleeding strips) 100 strips/pack
CTL Scientific Supply Corp PH INDICATOR STRIPS 4.5-10.0
pH-Fix indicator strips pH 4.5-10.0 (non-bleeding strips) 100 strips/pack
Sigma Aldrich Fine Chemicals Biosciences ExpandTM Long Range dNTPac
The Expand Long Range dNTPack is the second-generation version of the Expand Long Template PCR System optimized and designed to consistently amplify PCR products from 5kb up to 25kb from genomic DNA (or up to 40kb from lambda DNA templates). The supplied buffer can be used for all PCR product sizes. In addition a buffer without MgCl2 and separate vials of MgCl2 and DMSO are included if optimization is needed. Expand Long Range dNTPack contains a special enzyme mix that consists of thermostable Taq DNA Polymerase and a thermostable DNA polymerase with proofreading activity. This powerful polymerase mixture produces a high yield of PCR product. Due to the inherent 3-5 exonuclease activity of the proofreading polymerase Expand Long Range dNTPack copies DNA three times more accurately than Taq DNA Polymerase.
CTL Scientific Supply Corp QUANTOFIX PEROXIDE
QUANTOFIX FOR PEROXIDE 100 strips/pack. Test sticks for the semi-quantitative determination of hydrogen peroxide (H 2 O 2 ) and peroxides in solutions Gradation of scale: 0-0,5-2-5-10-25 mg/l H 2 O 2 white to blue QUANTOFIX � Peroxide is also suited for the determination of other inorganic and organic hydroperoxides. For the determination of hydroperoxides in organic solvents the test field is moistened with a drop of water after evaporation of the solvent. Between pH 2 and 9 the reaction is independent of the pH value of the test solution. Strongly acidic solutions should be buffered with sodium acetate, alkaline solutions are adjusted to pH 5 - 7 using citric acid. Strong oxidizing agents interfere.
Electron Microscopy Sciences pH Indicator Papers - Test Papers, 0.0 - 6.0, 100/bx
The indicator dyes of pH-Fix sticks are substantially bound to the cellulose fibers and as a result the possibility of the color bleeding, even in strongly basic solutions, is avoided. The dyes provide a sharp differentiation between the individual pH values and a clear and easy comparison to the color scale. Measurement of pH value is possible even in unbuffered or very weakly buffered solutions, since the sticks can be left in the solution until the final color change is completed. Test samples are not contaminated by the indicator dyes.
Gradations: 0.5
Electron Microscopy Sciences pH Indicator Paper 1.7 - 3.8
The indicator dyes of pH-Fix sticks are substantially bound to the cellulose fibers and as a result the possibility of the color bleeding, even in strongly basic solutions, is avoided. The dyes provide a sharp differentiation between the individual pH values and a clear and easy comparison to the color scale. Measurement of pH value is possible even in unbuffered or very weakly buffered solutions, since the sticks can be left in the solution until the final color change is completed. Test samples are not contaminated by the indicator dyes.
Gradations: 0.3
Sigma Aldrich Fine Chemicals Biosciences ExpandTM Long Range dNTPac
The Expand Long Range dNTPack is the second-generation version of the Expand Long Template PCR System optimized and designed to consistently amplify PCR products from 5kb up to 25kb from genomic DNA (or up to 40kb from lambda DNA templates). The supplied buffer can be used for all PCR product sizes. In addition a buffer without MgCl2 and separate vials of MgCl2 and DMSO are included if optimization is needed. Expand Long Range dNTPack contains a special enzyme mix that consists of thermostable Taq DNA Polymerase and a thermostable DNA polymerase with proofreading activity. This powerful polymerase mixture produces a high yield of PCR product. Due to the inherent 3-5 exonuclease activity of the proofreading polymerase Expand Long Range dNTPack copies DNA three times more accurately than Taq DNA Polymerase.
CTL Scientific Supply Corp QUANTOFIX NITRITE
QUANTOFIX NITRITE 100 strips/pack Test strips for the semi-quantitative determination of nitrite in solutions. Gradation of scale: 0-10-25-50-100-250-500-1000 ppm SO32-
CTL Scientific Supply Corp QUANTOFIX NICKEL
Test strips for the semi-quantitative determination of nickel (Ni 2+ ) in solutions. 100 strips/pack Gradation of scale: 0-10-25-50-100-250-500-1000 ppm.
Fisherbrand™ Alkacid™ Full-Range pH Kit
pH accuracy to ±0.25
Fisher Chemical™ pH Indicator Solutions
For use in a variety of pH test sets
