0000000000702893

AUTHOR

Mārtiņš Jansons

showing 6 related works from this author

Atskaišu veidošanas rīku salīdzinājums un pielietojums

2008

Bakalaura darbā tiek salīdzināti trīs atskaišu veidošanas rīki – bezmaksas DataVision, maksas SQL Reporting Services un Crystal Reports. Darbā tiek definētas mūsdienu atskaišu prasības un izmantojot šīs prasības kā vērtēšanas kritēriju, tiek meklētas atskaišu veidošanas rīku stiprās un vājās puses. Darba beigās autors dalās savā pieredzē un dod padomus efektīvai atskaišu izstrādei.

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Development and application of mass spectrometric methods for the determination of glyphosate and its metabolites in plant and animal origin products…

2021

Promocijas darbā izstrādātas un pielietotas metodes glifosāta un tā sabrukšanas produktu noteikšanai augu un dzīvnieku izcelsmes produktos, bioloģiskajos un vides objektos, izmantojot šķidruma hromatogrāfiju un masas spektrometriju. Glifosāts un tā sabrukšanas produkti ir mazmolekulāri savienojumi ar polārām funkcionālajām grupām, tāpēc to noteikšana ir problemātiska, un noteikšanai ir nepieciešamas efektīvas paraugu sagatavošanas un analīzes metodes, ar mazinātiem matricas efektiem un uzlabotu noteikšanas spēju. Promocijas darbā trijos galvenajos virzienos izpētītas iespējas uzlabot detektēšanu un kvantificēšanu – jonu hromatogrāfijā, vairāku stadiju paraugu sagatavošanā ar cietfāžu ekstra…

Analītiskā ķīmijaAnalytical chemistryĶīmija
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Occurrence of glyphosate in beer from the Latvian market.

2018

A sensitive LC-MS/MS method for the determination of glyphosate in beer has been developed, validated, and applied to analyse 100 beer samples from 24 different producers and distributors in Latvia. The selected samples represented most beer brands and varieties sold in local supermarkets. Different procedures for sample preparation and chromatographic separation were compared. The final version of the method consisted of solid phase extraction, chromatographic separation on aminopropyl stationary phase, and detection using tandem mass spectrometry. The concentration of glyphosate in beer varied from below the LOD of 0.2 μg kg-1 up to 150 μg kg-1, higher than previously reported. Significan…

Health Toxicology and MutagenesiseducationGlycineFood Contamination010501 environmental sciencesToxicology01 natural scienceschemistry.chemical_compoundTandem Mass SpectrometryLc ms msSample preparationSolid phase extractionFood science0105 earth and related environmental sciencesMathematicsFinal versionMarketing010401 analytical chemistryPublic Health Environmental and Occupational Healthfood and beveragesBeerGeneral ChemistryGeneral MedicineLatvia0104 chemical sciencesChromatographic separationchemistryStationary phaseGlyphosateFood ScienceFood contaminantChromatography LiquidFood additivescontaminants. Part A, Chemistry, analysis, control, exposurerisk assessment
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Evaluation of Glyphosate Ecotoxicity and Biodegradability in the Municipal Wastewaters

2018

Glyphosate (G) is a broad-spectrum systemic organophosphate herbicide being widely used to control weeds in agricultural fields and urban areas. Its safety for both human health and aquatic biomes is a subject of wide debate. This study was aimed at evaluating the removal efficiency and ecotoxicity of G based herbicide (GBH) Klinik® (Nufarm, Austria) added to the raw municipal wastewater (WW) in a lab-scale model column system. The effect of oxide ceramics as a filtering medium (treatment „B”), as well as activated sludge and nutrients (treatment „C”) was compared with the control columns, which contained only WW (treatment „A”). After 72h treatment of WW spiked with 100 mg/L G, the lowest …

021110 strategic defence & security studiesOxide ceramicsbiologyChemistryMechanical EngineeringDaphnia magna0211 other engineering and technologies02 engineering and technology010501 environmental sciencesBiodegradationbiology.organism_classification01 natural scienceschemistry.chemical_compoundMechanics of MaterialsGlyphosateEnvironmental chemistryGeneral Materials ScienceEcotoxicity0105 earth and related environmental sciencesKey Engineering Materials
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Occurrence of glyphosate in beer from the Latvian market

2018

A sensitive LC-MS/MS method for the determination of glyphosate in beer has been developed, validated, and applied to analyse 100 beer samples from 24 different producers and distributors in Latvia. The selected samples represented most beer brands and varieties sold in local supermarkets. Different procedures for sample preparation and chromatographic separation were compared. The final version of the method consisted of solid phase extraction, chromatographic separation on aminopropyl stationary phase, and detection using tandem mass spectrometry. The concentration of glyphosate in beer varied from below the LOD of 0.2 μg kg−1 up to 150 μg kg−1, higher than previously reported. Significan…

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Efektīvas pārskatu veidošanas metodes

2010

Maģistra darba ietvaros autors meklē metodes, kā efektīvāk veidot atskaites. Tiek dots neliels ieskats SQL Reporting Services un Crystal Reports salīdzinājumā. Pamatojoties uz to, ka darījuma lietotnēs var būt nepieciešamība izmantot vairākus atskaišu veidošanas rīkus un atskaites palaišanas mehānisms mēdz būt vienāds, autors veido universālu atskaišu darbināšanas mehānismu, tajā atspoguļojot iegūto pieredzi atskaišu veidošanā, ko autors ieguvis vairāk kā četru gadu laikā. Lai vēl vairāk samazinātu laiku, kas nepieciešams pārskata izveidei, un dotu atskaites lietotājam kontroli pār atskaiti, autors ir izveidojis rīku, kas no datu pieprasījuma ir spējīgs izveidot gala atskaiti. Ar šī rīka pa…

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