• Publications
  • Influence
Field studies on exposure, effects, and risk mitigation of aquatic nonpoint-source insecticide pollution: a review.
  • R. Schulz
  • Chemistry, Medicine
  • Journal of environmental quality
  • 1 March 2004
Recently, much attention has been focused on insecticides as a group of chemicals combining high toxicity to invertebrates and fishes with low application rates, which complicates detection in theExpand
A comparison of predicted and measured levels of runoff-related pesticide concentrations in small lowland streams on a landscape level.
The present model successfully explains the pesticide concentrations associated with single entry events caused by runoff, especially at concentration levels above (>or=0.5 microg/l), and is suitable for use in routine exposure assessment of pesticides on a landscape level. Expand
Antiviral drugs in wastewater and surface waters: a new pharmaceutical class of environmental relevance?
A significant reduction in concentrations was observed for acyclovir, lamivudine, and abacavir in treated wastewater indicating a substantial removal, while nevirapine, zidovudine and oseltamivir were found in similar concentrations in raw and treated wastewater. Expand
Biological Surface Coating and Molting Inhibition as Mechanisms of TiO2 Nanoparticle Toxicity in Daphnia magna
The production and use of nanoparticles (NP) has steadily increased within the last decade; however, knowledge about risks of NP to human health and ecosystems is still scarce. Common knowledgeExpand
Rainfall-induced sediment and pesticide input from orchards into the Lourens River, Western Cape, South Africa: importance of a single event.
  • R. Schulz
  • Environmental Science, Geography
  • Water research
  • 1 June 2001
Levels of contamination in the Lourens River exceeded the national water quality standards and those established by the US EPA and may result in acute toxic effects on aquatic invertebrates and fishes. Expand
Effectiveness of a constructed wetland for retention of nonpoint-source pesticide pollution in the Lourens River catchment, South Africa.
  • R. Schulz, S. Peall
  • Environmental Science, Medicine
  • Environmental science & technology
  • 15 January 2001
A toxicological evaluation employing a Chironomus bioassay in situ at the wetland inlet and outlet revealed an 89% reduction in toxicity below the wetlands during runoff. Expand
Assessment of insecticide contamination in runoff and stream water of small agricultural streams in the main soybean area of Argentina.
The first- and second-order streams, Brown and Horqueta, respectively, which are located in the main area of soybean production in Argentina were examined for insecticide contamination caused by runoff from nearby soybean fields, potentially endangering the aquatic fauna. Expand
Agricultural insecticides threaten surface waters at the global scale
The data show that more than 50% of detected insecticide concentrations exceed regulatory threshold levels, which indicates that surface water pollution resulting from current agricultural insecticide use constitutes an excessive threat to aquatic biodiversity and suggests the biological integrity of global water resources is at a substantial risk. Expand
Runoff-Related Pesticide Input into the Lourens River, South Africa: Basic Data for Exposure Assessment and Risk Mitigation at the Catchment Scale
The characterization of runoff-related pesticide input and the identification of areas of concern in the field are essential for a comprehensive assessment of risk and the planning of mitigationExpand
Invasive crayfish and crayfish plague on the move: first detection of the plague agent Aphanomyces astaci in the Romanian Danube.
Monitoring of occurrence of native A. leptodactylus and invasive O. limosus in the Romanian Danube demonstrated the presence of A. astaci DNA in at least 32% of the analysed invasive and native crayfish coexisting in the Danube, suggesting that O.Limosus may invade the sensitive Danube delta area in the mid-2060s, even without long-distance dispersal. Expand