Validacija uzorkovanja za analizu hranjivih tvari u urbanim površinskim vodama: studija slučaja potok Črnomerec

master's thesis

• Title (english): Validation of sampling for the analysis of nutrients in urban surface water: a case study of the Črnomerec stream
• Author: Hrvoje Ljubičić
• Mentor: Monika Zovko (mentor)
• Committee member: Monika Zovko (predsjednik povjerenstva)
• Committee member: Aleksandra Perčin (član povjerenstva)
• Committee member: Ivan Mustać (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Soil Amelioration); Zagreb
• Defense date and country: 2024-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Istraživanje je imalo dva cilja: odrediti prostornu i vremensku varijabilnost kakvoće vode potoka Črnomerec (Zagreb, Hrvatska) te ocijeniti validacijske pokazatelje uzorkovanja površinskih voda na primjeru ovog potoka. Uzorkovanje je provedeno na pet lokacija duž potoka od travnja do kolovoza 2024. godine, u skladu s normom HRN EN ISO 5667-6:2016. U laboratoriju su analizirani ključni parametri kao što su pH, električna vodljivost (EC), koncentracije dušika iz sume nitrata i nitrita (NO3NO2-N) i fosfora iz ortofosfata (PO4-P). Rezultati su pokazali varijabilnost kakvoće vode ovisno o lokaciji i vremenu, s povišenim koncentracijama NO3NO2-N i PO4-P u nizvodnim dijelovima potoka, što može upućivati na urbane aktivnosti. Vrijednosti pH su varirale od blago alkalnih u gornjim dijelovima do kiselijih u donjim dijelovima toka, dok je električna vodljivost bila veća nizvodno. Validacijski pokus potvrdio je visoku preciznost i ponovljivost uzorkovanja. Za precizniju validaciju pokazatelja hranjiva kao što su dušik i fosfor, preporuča se odabir lokacija s većim razlikama u koncentracijama, posebice onih gdje su vrijednosti ortofosfata iznad granice kvantifikacije korištenih instrumenata.

Abstract (english)

The research had two main objectives: to determine the spatial and temporal variability of the water quality in the Črnomerec stream (Zagreb, Croatia) and to evaluate the validation indicators of surface water sampling using this stream as a case study. Sampling was conducted at five locations along the stream from April to August 2024, following the HRN EN ISO 5667-6:2016 standard. Key parameters such as pH, electrical conductivity (EC), concentrations of nitrogen from the sum of nitrates and nitrites (NO3NO2-N), and phosphorus from orthophosphates (PO4-P) were analyzed in the laboratory.
The results showed variability in water quality depending on location and time, with elevated concentrations of NO3NO2-N and PO4-P in the downstream sections of the stream, potentially indicating the influence of urban activities. pH values ranged from slightly alkaline in the upper sections to more acidic conditions in the lower sections, while electrical conductivity was higher downstream. The validation experiment confirmed high precision and repeatability of the sampling. For a more accurate validation of nutrients such as nitrogen and phosphorus, it is recommended to select locations with greater differences in concentrations, particularly those where orthophosphate values exceed the quantification limit of the instruments used.

• Keywords: kakvoća vode; uzorkovanje; validacija; dušik; fosfor
• Keywords (english): Water quality; Sampling; Validation; Nitrogen; Phosphorus
• Language: croatian
• URN:NBN: urn:nbn:hr:204:733247
• Study programme: Title: Agricultural Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka poljoprivredne tehnike (magistar/ magistra inženjer/inženjerka poljoprivredne tehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2024-11-11 10:44:06