Richard M. Gersberg

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BACKGROUND Cigarette butts are the most common form of litter, as an estimated 4.5 trillion cigarette butts are thrown away every year worldwide. Many chemical products are used during the course of growing tobacco and manufacturing cigarettes, the residues of which may be found in cigarettes prepared for consumption. Additionally, over 4000 chemicals may(More)
A sampling program was conducted to assess the quality of runoff associated with a variety of land uses in the Tijuana River watershed, a binational river basin on the U.S. Mexican border. Generally, meta l concentrations in samples collected during the first two to four hours of runoff (early storm) were higher than those in samples collected 24 36 hours(More)
NARRATIVE SUMMARY Primary recreational water contact (wading, swimming, surfing, snorkeling, scuba diving) represents the greatest public health threat when waters are contaminated with sewage (Fujioka 1997). However, non-point source pollution, rather than sewage, is the source of most coastal water pollution (Novotny 1988) where the concentrations of(More)
A summary of all existing information gathered since 1980 on contaminants in bairdiella (Bairdiella icistia), or-angemouth corvina (Cynoscion xanthulus), and sargo (Anisotremus davidsonii) living in the Salton Sea is presented. Comparisons are made with an earlier analysis of contaminants in tilapia (Oreochromis mossambicus x O. urolepis hornorum hybrid).(More)
NARRATIVE SUMMARY The aim of this study was to develop a quantitative assay for measuring the hepatitis A virus (HAV) load in ocean water samples. Viruses are often present in very low concentrations in water samples, and therefore require an extremely sensitive method such as polymerase chain reaction (PCR) for monitoring. Real-time PCR is one of the(More)
The treatment efficiencies of floating treatment wetlands (FTWs) containing two types of macrophytes, Typha angustifolia and Canna iridiflora, were investigated in a pilot scale study in the tropical climate of Sri Lanka. In batch experiments, over 80 % of biological oxygen demand (BOD5) and ammonium (NH 4 + -N) removal was observed, while nitrate (NO 3 −(More)
Nitrate labeled with (13)N ((13)NO(3)(-)) was produced in a cyclotron by the (16)O(p, alpha)(13)N reaction with protons having energies of 14.5 million electron volts. The (13)NO(3)(-) was used as a tracer for direct quantitative measurements of denitrification rates in soils from flooded rice fields. The (13)N technique provides a new tracer method for the(More)
In this study, six mesocosms, including three subsurface flow constructed wetlands (SSF CWs) and three sand filters (without plants) were set up at the campus of Nanyang Technological University, Singapore. The objective of this study was to compare the removal efficiencies of chemical oxygen demand (COD), nitrogen (N) and total phosphorus (TP) under batch(More)
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