Monitor - ISSN 1472-0221
The Newsletter for Data Acquisition and Control
Issue 262 August 2020
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Elevated concentrations of cadmium in agricultural soils are of widespread concern due to its high toxicity. Cadmium causes liver and kidney damage and increases the risk of cancer. The World Health Organisation labelled it as on of the "ten leading chemicals of concern". Dissolved cadmium in soils ocurs from, amongst other sources, agriculture, industrial and mining activities. Plants like rice accumulate cadmium. Clay soils absorb cadmium and other metal ions like manganese.
Researchers in Zurich are assessing the influence of manganese on cadmium and attachment to clay soils. They predicted that elevated manganese ion concentrations would decrease cadmium attachment.
Part of the process involved taking measurements at different pH levels. The scientists used a Microlink to connect four burettes to a computer. The Microlink monitored the pH of clay suspension during acid-base titrations.
Unexpectedly, the team observed an increase in both manganese and cadmium with increasing pH. They concluded that in contaminated paddy fields used for rice production, manganese increased the retention of cadmium in the presence of clay minerals.
Natacha Van Groeningen et al, Surface precipitation of Mn2+ on clay minerals enhances Cd2+ sorption under anoxic conditions, Environ. Sci.: Processes Impacts, 2020, Advance Article DOI: 10.1039/D0EM00155D
A quick question. The memory of the Microlink 851 is stated as 65000 scans. Is this per channel or in total? If it's in total is there anyway the memory could be expanded to hold say 250000 or half a million scans?
One scan comprises a reading from each channel (eg each strain gauge or thermocouple). So with 16 channels the Microlink 851 data logger would store 16 x 65000 or 1040000 data points.
Stretchable sensor detects nitrogen dioxide
A stretchable, wearable gas sensor for environmental sensing has been developed whihc uses newly developed laser-induced graphene foam
Source: Penn State University
Break-through sensor for drones detects power lines
A novel sensor lets drones detect and avoid energised power lines.
Source: U.S. Army CCDC Army Research Laboratory
Understanding locust swarms could improve collision avoidance
Low-power collision detector mimics locust avoidance response
Source: National Science Foundation
New LiDAR Sensor Uses Mirrors to Achieve High Efficiency
Light Detection and Ranging (LiDAR) technology relies on fast, precisely timed laser pulses - a useful application for various kinds of sensors, including those that support the Internet of Things (IoT). However, until now sensors that rely on LiDAR were expensive, bulky, heavy and power hungry.
Source: The University of Chicago
Underwater robots reveal habits of endangered whales
Unmanned underwater gliders equipped with acoustic monitors recorded the sperm whale sounds over several months and 1000s of kilometres of ocean. Continuous day and night monitoring during winter months suggests different foraging strategies between different areas.
Source: SCUBA News
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