The environmental analytic is part of the chemical analytic and is focused on the quantitative and qualitative analysis of substances from the environment.
The area of environmental analyticis divided as followed in our lab:
- Waste water
We perform the following analytical methods for enviromental analytics in our lab:
- Settleable solids DIN 38409-9; H9
- Analysis of anions
- Atomic absorption spectroscopy (AAS)
- Bacteria/ Fungus
- Biochemical/Biological oxygen consumption (BSB5) DIN 38409-51; H51
- Chemical oxygen consumption (CSB) DIN 38409-41; H41
- Legionella, coliform bacteria, e.coli, total colonies at 22°C and 36°C
- pH Measurement
- Titration of aqueous solutions
- Water hardness
DIN 38409-9; H9
This method is used to estimate for example the amount of settleable mud of wastewater in a reservoir. The sample is placed in an Imhofftrichter (conical cylinder) and situated vertical and vibration-free. After 50 and 110 minutes the cylinder is suddenly rotated three times across its long axis to detach particles from the inner glass surface. After two hours the particles on the bottom of the cylinder are counted.
To determine the amount of anions like phosphate (or total phosphate according to DIN EN ISO 6878), nitrate or sulfate we use optical test with a photometer. For this purpose the anions are in general transformed into colored complexes. Finally the amount of anions is proportional to the decrease of the emitted light (according to the Lambert-Beersche law). Please contact us for further information’s concerning your sample.
Atomic absorption spectroscopy
We are using a flame atom absorption spectrometer (F-AAS) to analyze cations quantitatively in aqueous solutions. In principle the sample is atomized and a detector registers the decrease of light intensity of a hollow-cathode lamp which emits the proper wavelength of the cation of interest. This decrease is proportional to the amount of the according cation in the sample. Please contact us for further information’s concerning your sample.
To monitor aqueous solutions of machines we performtests for bacteria and fungus. Bacteria and fungus for example can influence the proper function of industrial washing machines and can be a health risk for workers.
Biological oxygen consumption (BSB5)
DIN 38409-51; H51
The BSB5 shows the amount of oxygen needed to degrade organic substances in an aqueous sample under standardized conditions. The sample is placed in an airtight flask and the reduction of oxygen is monitored by measuring the internal pressure. The occurring CO2 is bound chemical, so it can’t counteract the pressure reduction.
Chemical oxygen consumption (CSB)
DIN 38409-41; H41
The chemical oxygen consumption refers to the amount of oxygen which is needed to oxidize all oxidizable substances in an aqueous sample. For this purpose the sample is acidified and mixed with a strong oxidant. Afterwards the amount of oxygen is calculated according to the consumption of oxidant. For the final determination we use a photometer.
The ability of a chemical compound or mixture to conduct an electrical current is measured with a special electrode. By using this method you can get e.g. information’s if a sample is rain or tap water.
Legionella, coliform bacteria, e.coli, total colon
Drinking water is one of the most important natural goods. “The aim of the drinking water act is to protect the health of people from negative influences of impurities […]” (TrinkwV. 2011). The following microbiological parameters are analyzed: Total colonies at 22°C and 36°C, e.coli, coliform bacteria, enterococci, pseudomonas aeruginosa and clostridium perfringens.
Legionella: Since the 1st of November 2011 the new drinking water act (TrinkwV) is active. It contains among others new regulations concerning examinations for legionella in drinking water heating installations.
Further information’s concerning the drinking water act and legionella.
Legionella can easily proliferate in places with warm water. For example: Warm water production and distribution installations, public swimming pools, air washers of air conditioners, cooling towers, biofilms, hospitals, school showers and other public showers, public baths andwater tanks.
Legionella find ideal conditions in freshwater and salt water, temperature range 25°C up to 50°C, fresh water feeding and standing water.
Please contact us for further information’s.
The pH is measured with a reference electrode. The analytical device measures the potential differences between the reference solution inside of the electrode and the aqueous sample. This is the most precise way to measure the pH.
Titration of aqueous solutions
We perform routinely semi-automated titrations of water mixable cooling lubricants and industrial rinse water. Please contact us for further information’s.
For the determination of Ca2+ and Mg2+ of aqueous solutions, the sample is titrated with EDTA in the presence of an indicator. As soon as the indicator changes the color, the titration is terminated and the water hardness can be calculated.