Laboratory of Metrology in Chemistry
For more information: laboratory contact details on our contacts page).
Calibration of anemometers using Rotary Jib Standard (PNE) and Wind Tunnel Standard (TTE)
We carry out calibrations of anemometers using two standards. For lower air flow velocities we use the Rotary Jib Standard constructed by UT Testing Centre and for higher air flow velocities we use the Wind Tunnel Standard that is obtained by the support of EU. We also calibrate thermometers that belong to anemometers.
| Measurement range | Calibration and measurement capability |
| Rotary Jib Standard (0.1…5) m/s | (0.05…0.12) m/s |
| Wind Tunnel Standard (0.5…20) m/s | (0.08…0.6) m/s |
Calibration of air humidity measuring devices
For calibrating air humidity measuring devices we use the secondary humidity standard obtained by the support of EU. The main parts of the standard are the climatic chamber and the chilled mirror dew-point hygrometer. We also calibrate air thermometers that belong to humidity measuring devices. Estonian relative humidity calibration and measurement capabilities (CMC) have been published in the BIPM database.
| Measurement range | Calibration and measurement capability | ||
| Relative humidity | at temperatures | Reference standard | Working standard |
| (10…95) % | (25…60) °C | (0.7…2.3) % | (0.9…2.4) % |
| (25…95) % | (20…25) °C | (0.9…2.3) % | (1.1…2.4) % |
| (40…95) % | (15…20) °C | (1.2…2.3) % | (1.3…2.4) % |
| (50…95) % | (10…15) °C | (1.5…2.3) % | (1.6…2.4) % |
Calibration of air thermometers
| Measurement range | Calibration and measurement capability |
| (-10…80) °C | 0.2 °C |
Calibration of differential manometers
| Measurement range | Calibration and measurement capability |
| (-1000…2000) Pa | (1…5) Pa |
Calibration of nonautomatic electronic weighing instruments
| Measurement range | Calibration and measurement capability |
| (1…50) mg | 0.005 mg |
| (50…500) mg | 0.01 mg |
| (0.5…20) g | 0.03 mg |
| (20…50) g | 0.04 mg |
| (50…100) g | 0.07 mg |
| (100…200) g | 0.09 mg |
| (200…300) g | 0.16 mg |
| (300…400) g | 0.18 mg |
| (400…510) g | 0.3 mg |
Measurements and Analyses (not accredited)
We carry out different (often nonstandard) measurements and analyses that have not been accredited. In the case of interest you are asked to contact Koit Herodes or Ivo Leito (contact data on our contact page) who will inform you about our capability to perform different analyses and measurements.
Several examples of measurements and analyses we are capable to carry out are presented below.
Stability testing of nitrocellulose based propellants using stabilizer depletion
Nitrocellulose is the main component of many propellants. Nitrocellulose decomposes spontaneously during longtime preserving. Stabilizers are added to propellants in order to avoid decomposition. Stabilizers decompose in time as well and their effectivity reduces. The purpose of the current analysis is to study whether the amount of stabilizers in the propellants are sufficient for safe preserving. The method is based on NATO standard “Explosives, nitrocellulose-based propellants, stability test procedures and requirements using stabilizer depletion. AOP-48“.
Characterization of chemicals, materials and coatings using instrumental analysis methods
Characterization with instrumental analysis methods is necessary in product development, monitoring of production, notification of new chemicals, etc. We use the following techniques for characterization: Infrared spectroscopy (FT-IR), UV-Vis spectrophotometry, Nuclear magnetic resonance spectroscopy (FT-NMR, both 1H and 13C spectra) and Gas chromatography mass spectrometry (GC-MS). These techniques are mutually complementary and used all together give very good picture of the sample. As a result of characterization we issue certificate containing the spectra and chromatograms, together with interpretations.
Analysis of polymers, paints, coatings, chemicals etc materials using infrared (FT-IR) spectroscopy
Infrared spectroscopy allows to analyse the composition of a wide range of materials (polymers, coatings, paints, works of art, building materials, oils, etc). It is possible to determine the main constituents and the main impurities. In favourable cases the analysis can be quantitative. The amount of information obtained is strongly dependent on the material that is analysed and also on available reference materials.
Spectrophotometric analysis
It is possible to measure the content of iron in water and alloys.
Chromatographic methods are especially suited for analysis of individual compounds (especially volatile ones) in complex objects. In principle very wide range of objects are accessible to analysis (food, drugs, fuels, technological materials, etc). We mostly perform non-standard analyses and investigations that are not performed by routine analysis laboratories.
Pesticide residues determination in fruits and vegetables by LC-MS method
This method enables to determine the following pesticide residues: carbendazim, thiabendazole, imazalil, oxydemetton-methyl, aldicarb, aldicarb sulphone, aldicarb sulphoxide, methomyl, thiodicarb, phorate sulphone, phorate sulphoxide, methiocarb, methiocarb sulphone, methiocarb sulphoxide.
Potentiometry
Adjustment-calibration of pH meter and measurement of pH
Content of F- and NO3- ions in water
In addition to fluoride and nitrate ions we are also able to determine other ions.
Comparison of the readings of capacitive hygrometers with readings of an air humidity measuring instrument
Such a comparison is not as metrologically strict as a calibration but it affords to make comparison measurements outside the climatic chamber differently from our calibration method.
Determination of traces of water by coulometric Karl Fischer titration
Coulometric Karl Fischer titration is the standard method for analysis of traces of water down to ca 0.001%. It can be used for a wide variety of materials and samples. At our site it is possible to carry out sample manipulations in inert gas glovebox, thereby eliminating contamination of the sample with traces of water.
