EUTECH INSTRUMENTS CADMIUM EPOXY Instrukcja Obsługi Pobierz pdf (Strona 62)

...setting the standard again and again

Optical ▼ Introduction/Reagents and Accessories

Light source

Sample

Detector

Light

When light passes through a liquid, the amount of particles and

color in solution will affect the light. Optical techniques measure

solution characteristics by using a defined light source, passing

the light through a sample, and then measuring the light that

passes through the sample. Turbidimetric and colorimetric

methods both involve measuring the resulting light intensity. They

differ in that the light is attenuated by scattering in turbidimetry

and by absorption in colorimetry.

Both determinations may use similar instrumentation. By

employing different wavelengths of light and different optical

configurations, we can optimize the system for determining the

transmitted light of interest for a given analytical method.

Turbidity Calibration Set

For use with the T-100 turbidity

meter sold on page 61. Stable

standards ensure accurate

turbidity measurements.

Optical Measurement

Turbidimetry

The cloudiness in a liquid caused by the presence of finely

divided, suspended material is called “turbidity.” Turbidity

meters provide a means of quantifying this “cloudiness” by

determining the reduction of light passing through a turbid

solution and then comparing the results against a standard.

In some applications the clarity of solution is critical. In other

applications the appearance of particles indicates bacterial

growth. In either case the turbidimeter provides process

numerical data on the sample solution.

Colorimetry

The colorimetric method of chemical analysis involves

the measurement of light absorption by colored solutions.

While the differences in color development are visible to

the human eye, visual determination is subject to user

interpretation. Colorimeters eliminate the differences

encountered with color comparitors to produce an exact

numerical value—with greater resolution that can be

achieved through comparitors. Colorimeters use the well-

understood principals of wet chemistry to provide precise,

repeatable analysis methods. For example, the standard

DPD method for determining free and total chlorine is well

accepted and approved by the US EPA.

Reagents and Accessories

Reliable reagents and standards ensure accurate

measurement for turbidimeters and colorimeters

Catalog number Description Included

WD-35635-50

Calibration set

One each of primary calibration standard

cuvettes filled with 0.02, 20.0, 100, and

800 NTU standards

Catalog number Description Included

WD-35645-60

pH reagent Dropper bottle, for 50 tests

WD-35645-62

Cyanuric acid reagent 100 foil packs

WD-35645-64

Free-chlorine reagent DPD 100 foil packs

WD-35645-66

Total-chlorine reagent DPD 100 foil packs

WD-35645-68

Chlorine dioxide reagent 100 foil packs

Cuvettes

For use with the turbidity meter

on page 61 and all colorimeters

on pages 62–63. High-quality

borosilicate glass ensures good

light transmittance. Indexing mark

on each cuvette makes it

easy to get repeatable results.

Colorimeter Reagents

The pH reagent features a dropper

bottle making it easy to repetitively

provide the correct amount of reagent.

The convenient foil packs are ideal

for use in the field or in the lab. DPD

reagents follow US EPA method 330.5

for wastewater, and Standard Method

4500-Cl G for drinking water.

Secondary Chlorine

Standards

Verify performance of

your C201, C301 or C401

colorimeters.

Catalog number Description Included

WD-35645-70

Secondary standards Set of four vials

Catalog number Description Included

WD-35653-55

Cuvettes Pack of three

http://www.novatech-usa.com/Products/Laboratory-Equipment-Supply-Products Tel: (281) 359-8538 Toll Free:(866) 433-6682

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