Chemistry and Ecotoxicology postgraduate personal statement example

Personal statement example

Most of the river samples I collect at work are unremarkable. One Tuesday last year, though, a bottle I had filled below a disused lead mine came back from our laboratory with zinc well above the usual range for that site. Nothing dramatic followed: a colleague checked the storage, we resampled, and the second result was lower but still elevated after a week of heavy rain. What stayed with me was the question nobody in our team was positioned to answer. We could report a concentration, but we could not say much about what that zinc was doing to the invertebrates under the stones. I want to study chemistry and ecotoxicology at postgraduate level because I would like to be able to connect those two things properly.

I graduated with a 2:1 in Chemistry. Analytical and environmental chemistry were my strongest areas, and my final-year project measured copper in soils from allotments near a former railway yard. I digested samples with aqua regia and analysed them by ICP-OES, running certified reference material alongside each batch. The interesting part turned out to be organic matter: plots where tenants had added a lot of manure and compost held more total copper but released less in a simple calcium chloride extraction. That gave me a practical introduction to the difference between total concentration and the fraction that might be available to plants or soil organisms, an idea I have since seen at the centre of much of the ecotoxicology I have read about.

For the past two years I have worked as a sampling technician for a water company. The job is mostly careful routine: following chain-of-custody procedures, filtering and preserving samples correctly, recording field pH, temperature and conductivity, and keeping a van of equipment in order. I have learned how easily a result can be compromised before it reaches an instrument, and I have become the person on our team who rewrote the field sheets so that filtration times are recorded consistently. I am proud of that small change because it made later queries much quicker to resolve.

I have tried to fill the biological gap in my background deliberately. I completed a free online course in basic statistics using R and reworked my project data to fit a simple regression, which I had only done in a spreadsheet at university. I have read about the Biotic Ligand Model and how it predicts metal toxicity to aquatic organisms from water chemistry such as hardness, pH and dissolved organic carbon, and it made immediate sense of the variation I see between sites on my rounds. I also joined a local volunteer group carrying out kick-sampling for river invertebrates, where I am a beginner at identification but now recognise the common mayfly and caddisfly families.

Outside work I share a family allotment with my mother, which is partly why my undergraduate project interested me, and I cycle with a club most weekends. Long rides along river valleys I also sample for work have given me an odd double familiarity with the same places.

In postgraduate study I hope to develop laboratory skills in exposure testing and to understand how chemical speciation, bioaccumulation and effects on organisms are studied together rather than in separate departments. I would particularly like to work on metals or other persistent contaminants in freshwater systems, though I want to keep an open mind until I have broader training. I bring reliable analytical practice, field experience in all weathers and a habit of checking where numbers come from. I would like to learn to ask what those numbers mean for living things.