DETERMINATION OF RESIDUAL QUANTITIES OF NEODISHER LABOCLEAN PLM DETERGENT ON LABWARE
DOI:
https://doi.org/10.11603/2312-0967.2020.1.10903Keywords:
cleanliness of automated washing of laboratory glassware, detergent, Neodisher Laboclean PLM, disinfection and washing machine, substances that are oxidized, conductivity, specific electrical conductivity, calibration scheduleAbstract
The aim of the work. The development of simple rapid approaches for residual quantities of Neodisher Laboclean PLM detergent in laboratory glassware determining, which are based on the use of pharmacopeia methods (testing the electrical conductivity and the test “oxidizable substances”) and assessing the quality of glassware washing with a disinfection-washing machine.
Materials and Methods. Distilled and deionized water was obtained, respectively, on a GFL2008 aquadistillator and a Millipore Direct-Q 3 UV system. Conductivity studies were performed on a Hanna HI 2300 conductivity meter. Neodisher LaboClean PLM detergent solutions were used. Washing of laboratory glassware was carried out in a G7883 disinfection-washing machine.
Results and Discussion. The electrical conductivity of solutions of various concentrations of Neodisher Laboclean PLM was measured. The obtained data was processed by Excel in order to build a calibration graph and derive its mathematical equation. These approaches, despite the lack of selectivity, make it possible to identify residual contamination of laboratory glassware with Laboclean PLM detergent in concentrations, respectively, of 10-5% and 10-2%. In a similar way, a calibration graph was obtained and the residual amount of one of the hardness salts of tap water (CaCO3) – was estimated. Studies of the cleanliness of laboratory glassware after washing in a washer-disinfector were carried out on the basis of the received data.
Conclusions. The obtained data (0.8–3.2 and 2.3–10.0 μg/dishware, respectively, for Neodisher LaboClean PLM detergent and CaCO3) indicate that the cleanliness of laboratory glassware after washing in a G7883 washer-disinfector is satisfactory for solving of the most tasks of analytical and pharmaceutical chemistry.
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