In a newly published USGS study of cyanobacterial blooms in Midwest lakes, taste-and-odor compounds were found almost every time cyanotoxins were found, indicating odor may serve as a warning that harmful toxins are present.
“It is commonly believed that there are no health risks associated with taste-and-odor compounds,” said Dr. Jennifer Graham, USGS limnologist and lead scientist on this study. “While taste-and-odor compounds are not toxic, these pungent compounds were always found with cyanotoxins in the blooms sampled. This finding highlights the need for increased cyanotoxin surveillance during taste-and-odor events so that the public can be advised and waters can be effectively treated.”
Cyanotoxins are produced by some cyanobacteria. Cyanobacteria commonly form a blue-green, red or brown film-like layer on the surface of lakes and reservoirs. This phenomenon is frequently noticed in the United States during the summer, but also occurs during other seasons.
Cyanotoxins can be poisonous to people, aquatic life, pets and livestock. Removing or treating affected water can be both costly and time-intensive. Cyanotoxins are currently on the U.S. Environmental Protection Agency’s drinking-water contaminant candidate list, and many states include cyanotoxins in their freshwater beach-monitoring programs.
“Exposure to these toxins has caused a range of symptoms including skin rashes, severe stomach upset, seizures, or even death,” said Dr. Keith Loftin, USGS research chemist and environmental engineer. “Pets and livestock are most susceptible to direct exposure, but people can also be affected during recreation, by eating contaminated foods, or by drinking contaminated water that has not been treated properly.”
For this study, a cyanobacterial bloom from each of 23 lakes in Iowa, Kansas, Minnesota and Missouri was sampled and analyzed for thirteen toxins and two taste-and-odor compounds. Lakes were targeted based on a known history of cyanobacterial bloom occurrence.
Microcystins, a specific type of toxin, are often the only cyanotoxin considered when evaluating risks associated with cyanobacteria in waters used for recreation or drinking water supply. Microcystins were found in all samples; however, this study also indicates that toxins other than microcystins may be more common than previously thought.
Taste-and-odor compounds were detected in 91 percent of samples. Since toxins occurred more frequently than taste-and-odor compounds, odor alone does not provide sufficient warning to ensure human-health protection against cyanotoxin exposure.
If you think you see a harmful algal bloom, avoiding it is the first course of action. A good second step is to notify local authorities responsible for the affected area, such as a lake manager, state health department, or other relevant state agencies.
The full journal article, published by Environmental Science and Technology, as well as additional information, photos, and an audio podcast about cyanobacteria, can be accessed at http://toxics.usgs.gov/highlights/algal_toxins/.
Kara Capelli | EurekAlert!
100 % Organic Farming in Bhutan – a Realistic Target?
15.06.2018 | Humboldt-Universität zu Berlin
What the size distribution of organisms tells us about the energetic efficiency of a lake
05.06.2018 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...
Water molecules exist in two different forms with almost identical physical properties. For the first time, researchers have succeeded in separating the two forms to show that they can exhibit different chemical reactivities. These results were reported by researchers from the University of Basel and their colleagues in Hamburg in the scientific journal Nature Communications.
From a chemical perspective, water is a molecule in which a single oxygen atom is linked to two hydrogen atoms. It is less well known that water exists in two...
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
18.06.2018 | Earth Sciences
18.06.2018 | Process Engineering
18.06.2018 | Life Sciences