Application Archive

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Here you can find more Applications which are useful in Photometry:

Mercury Free COD Measurement: common COD cuvette quick tests that contain mercury, can be replaced with mercury-free test sets. But what does this mean for the quality of the measuring results?

SAC is Not Equal to SAC: SAC is used to determine the sum of the dissolved organic water content substances by means of laboratory or process photometers.

Influence of the temperature on the response time and measuring results of test sets: Why is the temperature of samples important? This article shows how the sample  temperature affects the color reactions of the tests and thus measuring results and how this source of error can be avoided.

Photometry: Decreasing disturbing influences and avoiding error sources: Optimized measurement – what should be observed in particular? This article shows how you can reduce interferences and avoid sources of error.

10-point calibration: Uranin measurement - creating an individual measurement method: Programming an individual measurement method, offers the user the possibility to adress individual needs of a particlular laboratory. Using Uranium measurement as an example, in this article the programming of an individual method is described step-by-step.

From a Calibration Curve to Photometric Method Data: What use is an analytical instrument or method, if you cannot be sure of the accuracy of the results? Apart from the Analytical Quality Assurance AQA, calibration of the instruments also plays an important role in securing the good quality of the analytical results.

Analytical Quality Assurance AQA: AQS and SOPs can be carried out automatically by the instrument. This pdf shows how such procedures can be set up using an instrument from WTW.

Special Photometric Procedures and Multi-step Measurements: Special photometric procedures and multi-step measurements shown by means of three examples: chlorophyll, wine color, and sugars.

Photometric Determination of D-Glucose: A step-by-step instruction to programming a method for D-glucose determination with WTW photoLab UV-VIS photometers.

Chlorophyll a: This article describes the determination of the chlorophyll a content in surface water.

Method updates for photometers: In this article you will find clues how to keep your device up to date.

Pipette is not equal to pipette: What can go wrong when pipetting? Very much! To guarantee the quality of pipetting and thus the experiment, this article describes meaningful steps for quality assurance.

Comparing the Bulbs: A short comparison of laboratory photometers which use Wolfram Halogen lamps and hand held devices which use LEDs.

Method-Updates: The importance of using method-updates for keeping stored curve data and settings such as wavelengths, blank values etc. for test kits and other processes up to date.

The advantages of reagent tests: In contrast to pre-prepared cuvette tests, reagent tests are set up by the user him/herself and measured in rectangular cuvettes. Although it may seem a little less convenient they have several advantages – from the barcode to the economic efficiency.

Testing in the field (1): In this report we discuss the role of reagents in this monitoring and in environmental monitoring.

Testing in the field (2): As the monitoring of water grows in significance, mobile photometric testing is becoming more important. WTW’s pocket photometer, pHotoFlex series is a trail blazer with regards to mobile photometry in laboratory quality standards.

Iron is simply everywhere: Measuring iron content is one of the most important tests in water analysis. Taking a closer look at the choice of correct tests and test kits.

Depth Profiles: As part of a science project, high school students measured the depth profiles for pH, conductivity and oxygen as well as the visibility depth of the Klostersee near Ebersberg. A glimpse into the world of limnological water monitoring.

Spectral UV-VIS and UV Online Sensors: Technology and application of WTW spectral online sensors.

Analytical Quality Assurance: The Analytical Quality Assurance (AQA) guarantees to eliminate these error sources as far as possible.

AQA PhotoLab: The MatrixCheck of the WTW photoLab® spectrophotometers is an effective means for the search of  these disturbing factors.

Correct COD Detemination: You should take the following factors for the precise determination of the COD value into consideration, so that the results can withstand the inspection by the authorities. Read our PDF.

Choose the Best Test: The number of offered test sets is large. The following observations are helpful for a basic decision.

Practical Use of Photometric Test Sets: How to avoid error sources in photometry: handling of reagents, cuvette preparations, disturbing ions, dwelling times, sample volumes, sample matrix. Read our PDF.

Online Measurement Brought into the Lab: OptRF - optical reagent-free measurement of COD, Nitrate and Nitrite.

Data to the Lab and Back: For the data exchange between the WTW online measuring systems and photolab 6000/7000 photometers a USB stick is all you need.

Optical Reagent-Free Measurement of COD, Nitrate, Nitrite with photoLab 7600: A presentation of the optical reagent-free measurement procedure



Xylem Analytics Germany Sales GmbH & Co., WTW
Dr.-Karl-Slevogt-Str. 1
82362 Weilheim
Phone: +49 881 183 0
Telefax: +49 881 183 420

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