Photometric Tests

For measuring methods in the wavelength range of visible light, i.e. the photometry, high quality products are a must to achieve the best possible test results. For these so-called "transmission measurements" the concentrations of color solutions are determined by using the visible light - this is done in cuvettes.

Therefore cuvette tests are analytical methods with which chemical parameteres of solutions are determined by photometry. Very popular are disposable cuvettes (one use only) which already contain the required solutions in the right amount. Thanks to their simple handling they are often used, particularly in water analysis:

  • sewage treatment plants
  • waterworks
  • breweries
  • dairies

and in many other areas.

At Analytics-Shop you will find numerous cell tests for your lab applications from different manufacturers: Merck Millipore, Sigma Aldrich, WTW and Aqualytic. If you have any questions about our products, please do not hesitate to contact our staff. Our customer service will be happy to advise you independently and free of charge.

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Product Image of Ozone RT 1200 pcs.
Ozone RT 1200 pcs.
Item number: WW252054
Brand: WTW
€304.10
Product Image of SO3 01746 Reagent test 1.0-60.0 mg/l, Model name : SO3 01746
SO3 01746 Reagent test 1.0-60.0 mg/l, Model name : SO3 01746
Item number: WW252053
Brand: WTW
€208.60
Product Image of Cadmium RT 55 pcs.
Cadmium RT 55 pcs.
Item number: WW252051
Brand: WTW
€206.50
Product Image of Fluoride RT 100 pcs.
Fluoride RT 100 pcs.
Item number: WW252048
Brand: WTW
€250.00
Product Image of Magnesium KT 25 pcs.
Magnesium KT 25 pcs.
Item number: WW252043
Brand: WTW
€148.70
Product Image of Total hardness KT 25 pcs.
Total hardness KT 25 pcs.
Item number: WW252039
Brand: WTW
€141.40
Product Image of Manganese KT 25 pcs.
Manganese KT 25 pcs.
Item number: WW252035
Brand: WTW
€148.70
Product Image of Pb lead RT 50 pcs.
Pb lead RT 50 pcs.
Item number: WW252034
Brand: WTW
€147.80
Product Image of Chlorine dioxide RT 200 pcs.
Chlorine dioxide RT 200 pcs.
Item number: WW252017
Brand: WTW
€135.00
Product Image of Ozone RT 200 pcs.
Ozone RT 200 pcs.
Item number: WW252016
Brand: WTW
€98.00
Product Image of Cl2 00602/1 reagent test 0.010 - 7.50 mg/l Cl2, Model name : Cl2 00602/1
Cl2 00602/1 reagent test 0.010 - 7.50 mg/l Cl2, Model name : Cl2 00602/1
Item number: WW252013
Brand: WTW
€98.00
Product Image of Cl2 00599 reagent test 0.010 - 7.50 Cl2, Model name : Cl2 00599
Cl2 00599 reagent test 0.010 - 7.50 Cl2, Model name : Cl2 00599
Item number: WW252012
Brand: WTW
€87.50
Product Image of Cl2 00598/2 reagent test 0.010 - 7.50 Cl2, Model name : Cl2 00598/2
Cl2 00598/2 reagent test 0.010 - 7.50 Cl2, Model name : Cl2 00598/2
Item number: WW252011
Brand: WTW
€90.00
Product Image of Cl2 00598/1 reagent test 0.010 - 6.00 Cl2, Model name : Cl2 00598/1
Cl2 00598/1 reagent test 0.010 - 6.00 Cl2, Model name : Cl2 00598/1
Item number: WW252010
Brand: WTW
€250.00
Product Image of Powder test SO4 0-70 mg/l, Model name : SO4-2 TP
Powder test SO4 0-70 mg/l, Model name : SO4-2 TP
Item number: WW251423
Brand: WTW
€50.00
Product Image of Powder test SiO2 (pL) 1-200 mg/l, Model name : Si-3 TP (HR)
Powder test SiO2 (pL) 1-200 mg/l, Model name : Si-3 TP (HR)
Item number: WW251422
Brand: WTW
€134.00
Product Image of Powder test NO2-N 0.002-0.300 mg/l, Model name : NO2-3 TP
Powder test NO2-N 0.002-0.300 mg/l, Model name : NO2-3 TP
Item number: WW251420
Brand: WTW
€55.00
Product Image of Powder test Mo 0.3-40.0 mg/l, Model name : Mo-2 TP
Powder test Mo 0.3-40.0 mg/l, Model name : Mo-2 TP
Item number: WW251418
Brand: WTW
€157.00
Product Image of Powder test Mn 0.007-0.700 mg/l, Model name : Mn-2 TP
Powder test Mn 0.007-0.700 mg/l, Model name : Mn-2 TP
Item number: WW251417
Brand: WTW
€78.00
Product Image of Powder test Cl2 total 0.0-5.0 mg/l, Model name : CL2-4 TP
Powder test Cl2 total 0.0-5.0 mg/l, Model name : CL2-4 TP
Item number: WW251415
Brand: WTW
€30.00
Product Image of Powder test Cl2 total 0.00-2.00 mg/l, Model name : Cl-3 TP
Powder test Cl2 total 0.00-2.00 mg/l, Model name : Cl-3 TP
Item number: WW251414
Brand: WTW
€30.00
Product Image of Powder test SO4 0-70 mg/l SO4, Model name : SO4-1 TP
Powder test SO4 0-70 mg/l SO4, Model name : SO4-1 TP
Item number: WW251413
Brand: WTW
€42.00
Product Image of Powder test Si 0-100 mg/l SiO2 0-47 mg/l Si, Model name : Si-2 TP (HR)
Powder test Si 0-100 mg/l SiO2 0-47 mg/l Si, Model name : Si-2 TP (HR)
Item number: WW251412
Brand: WTW
€94.00
Product Image of Powder test Si 0-1.6 mg/l SiO2 0-0.7 mg/l Si, Model name : Si-1 TP (LR)
Powder test Si 0-1.6 mg/l SiO2 0-0.7 mg/l Si, Model name : Si-1 TP (LR)
Item number: WW251411
Brand: WTW
€84.00
Product Image of Powder test PO4 0-0.82 mg/l PO4-P 0-2.5 mg/l PO4, Model name : PO4-1 TP
Powder test PO4 0-0.82 mg/l PO4-P 0-2.5 mg/l PO4, Model name : PO4-1 TP
Item number: WW251410
Brand: WTW
€49.00
Product Image of Powder test NO2 0.0-0.2 mg/l NO2-N 0-0.66 mg/l NO2, Model name : NO2-1 TP
Powder test NO2 0.0-0.2 mg/l NO2-N 0-0.66 mg/l NO2, Model name : NO2-1 TP
Item number: WW251409
Brand: WTW
€47.00
Product Image of Powder test NH4 0-0.5 mg/l NH4-N 0-0.64 mg/l NH4, Model name : NH4-1 TP
Powder test NH4 0-0.5 mg/l NH4-N 0-0.64 mg/l NH4, Model name : NH4-1 TP
Item number: WW251408
Brand: WTW
€214.00
Product Image of Powder test Mo0.0-35,0 mg/l Mo, Model name : Mo-1 TP
Powder test Mo0.0-35,0 mg/l Mo, Model name : Mo-1 TP
Item number: WW251407
Brand: WTW
€130.00
Product Image of Powder test Mn 0.0-20.0 mg/l Mn, Model name : Mn-1 TP
Powder test Mn 0.0-20.0 mg/l Mn, Model name : Mn-1 TP
Item number: WW251406
Brand: WTW
€76.50
Product Image of Powder test Fe 0-3.0 mg/l Fe, Model name : Fe-2 TP
Powder test Fe 0-3.0 mg/l Fe, Model name : Fe-2 TP
Item number: WW251405
Brand: WTW
€29.90
Product Image of Powder test Fe 0.0-1.8 mg/l Fe, Model name : Fe-1 TP
Powder test Fe 0.0-1.8 mg/l Fe, Model name : Fe-1 TP
Item number: WW251404
Brand: WTW
€42.00
Product Image of Powder test Cu 0.0-5.0 mg/l Cu, Model name : Cu-1 TP
Powder test Cu 0.0-5.0 mg/l Cu, Model name : Cu-1 TP
Item number: WW251403
Brand: WTW
€53.10
Product Image of Powder test Cl2 0.0-5.0 mg/l Cl2, Model name : Cl-2 TP
Powder test Cl2 0.0-5.0 mg/l Cl2, Model name : Cl-2 TP
Item number: WW251402
Brand: WTW
€30.50
Product Image of Powder test Cl2 0-2.00 mg/l Cl2, Model name : Cl-1 TP
Powder test Cl2 0-2.00 mg/l Cl2, Model name : Cl-1 TP
Item number: WW251401
Brand: WTW
€30.50
Product Image of Powder test Al 0.00-0.22 mg/l Al, Model name : Al-1 TP
Powder test Al 0.00-0.22 mg/l Al, Model name : Al-1 TP
Item number: WW251400
Brand: WTW
€193.00
Product Image of REC 50/2 for reduced test volume
REC 50/2 for reduced test volume
Item number: WW250616
Brand: WTW
€251.00
Product Image of Crack-Set 20 14963 revealing reagents, Model name : Crack-Set 20 14963
Crack-Set 20 14963 revealing reagents, Model name : Crack-Set 20 14963
Item number: WW250497
Brand: WTW
€163.70
Product Image of Hydrazine Reagent test 0,005-2,00mg/l, Model name : N2H4 09711
Hydrazine Reagent test 0,005-2,00mg/l, Model name : N2H4 09711
Item number: WW250493
Brand: WTW
€112.50
Product Image of Cyanide RT 100 pcs., on sale
Cyanide RT 100 pcs., on sale
Item number: WW250492
Brand: WTW
€162.70
Product Image of Cl 14897 Reagent test 2.5 - 250 mg/l Cl, Model name : Cl 114897
Cl 14897 Reagent test 2.5 - 250 mg/l Cl, Model name : Cl 114897
Item number: WW250491
Brand: WTW
€148.40
Product Image of Zn 06146 Zinc Reagent 6 (Isobutylmethyl-keton), Model name : Zn 06146
Zn 06146 Zinc Reagent 6 (Isobutylmethyl-keton), Model name : Zn 06146
Item number: WW250452
Brand: WTW
€82.90
Product Image of Zinc KT 90 pcs.
Zinc KT 90 pcs.
Item number: WW250451
Brand: WTW
€298.20
Product Image of Nitrite RT 1000 pcs.
Nitrite RT 1000 pcs.
Item number: WW250445
Brand: WTW
€246.40
Product Image of Ni 14785 Reagent test 0.02 - 5.00 mg/l Ni, Model name : Ni 14785
Ni 14785 Reagent test 0.02 - 5.00 mg/l Ni, Model name : Ni 14785
Item number: WW250443
Brand: WTW
€192.40
Product Image of Manganese RT 500 pcs.
Manganese RT 500 pcs.
Item number: WW250442
Brand: WTW
€235.40
Product Image of Copper RT 250 pcs.
Copper RT 250 pcs.
Item number: WW250441
Brand: WTW
€216.20
Product Image of Nitrite RT 335 pcs.
Nitrite RT 335 pcs.
Item number: WW250440
Brand: WTW
€144.50
Product Image of Iron KT 250 pcs.
Iron KT 250 pcs.
Item number: WW250439
Brand: WTW
€111.10
Product Image of Au 14821 Reagent test 0.5 - 12.0 mg/l Au, Model name : Au 14821
Au 14821 Reagent test 0.5 - 12.0 mg/l Au, Model name : Au 14821
Item number: WW250436
Brand: WTW
€728.00
Product Image of Iron KT 1000 pcs.
Iron KT 1000 pcs.
Item number: WW250435
Brand: WTW
€247.20

Photometry

In laboratories in general photometry describes the method of determining the concentration of colored solutions with the aid of light. Here, white light is projected through a prism onto a screen. Depending on which wavelength is used, the color of the test object or of the test solution changes:

  • 390 - 435 nm: purple / violet
  • 435 - 495 nm: blue
  • 495 - 570 nm: green
  • 570 - 590 nm: (greenish) yellow
  • 590 - 630 nm: orange
  • 630 - 770 nm: red

As a light source either infrared or ultraviolet light can be used. Infrared radiation, also called radiant heat is radiated  by a body even more the warmer it is. Therefore infrared radiation occurs primarily in medically treating premature infants in incubators, but the energy efficiency of homes can also be determined. UV radiation, however, has the ability to kill bacteria. They are used in the sterilization in the operating room, as well as to kill germs in food. Furthermore the UV light is used for curing composite fillings in dental practices - the majority, however, know the UV light in conjunction with solariums and sun beds. UV light in sun beds is used to build up vital vitamin D.

The principle of the photometry is based on the attenuation of the light as it passes through matter. The weakening of the light is the result of an interaction between light of a specific wavelength and of the test substance that needs to be present as a solution. The amount of light attenuation is a measure of the concentration, under specified conditions.

Standard solutions for photometry

The lab user can choose from two different options when using cuvette tests. One of these are standard solutions which are used as a stock solution for dilution of solutions, e.g. in water analysis.

These freshly prepared control standards from stock solutions must be used in a few parameters (e.g. nitrite) since they are subject to rapid change. When using these standard solutions, the correct amount of dilution must be calculated and carried out by hand. A series of standard solutions which must be freshly prepared on a regular basis:

  • nitrite
  • free chlorine
  • formaldehyde
  • hydrazine
  • silicon
  • sulfite
  • hydrogen peroxide
  • anionic surfactants

and some more. Apart from the additional "effort" having to create the solutions again and again, these control standards are generally cheaper than the ready-to-use multi-parameter standards.

Multi-parameter standards for photometry

The second option is therefore the use of solutions that have already been created, the ready-to-use so-called multi-parameter standards. They convince with a simple handling since they already have the right concentration to the test set. Compared to the already named standard solutions there is no need for dilution with calculations for concentration and pipetting volume - thus accidental volume and pipetting errors can be avoided. Furthermore those standards score with pre-increase solutions for the study of matrix effects or interfering ions.