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August 2020

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Monitor - ISSN 1472-0221
The Newsletter for Data Acquisition and Control
Issue 262 August 2020

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Contents

* Investigating pH effect on Cadmium levels
* Your DAQ Questions Answered
* Data Acquisition News Round-Up


Investigating pH effect on Cadmium levels

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.

ph graphs
Windmill software logged the pH

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.

Further reading
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


Your Data Acquisition Questions Answered: Memory Size of Data Acquisition data logger

Question

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?

Answer

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.


DAQ News Round-up

Welcome to our round-up of the data acquisition and control news. If you would like to receive more timely DAQ news updates then follow us on Twitter - @DataAcquisition - or grab our rss feed.

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
https://news.psu.edu/

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
https://www.army.mil/

Understanding locust swarms could improve collision avoidance

Low-power collision detector mimics locust avoidance response
Source: National Science Foundation
https://www.nsf.gov/

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
https://spectrum.ieee.org/

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
https://news.scubatravel.co.uk/

sperm whale
Sperm whale

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