Water Pollution Monitoring

Novel instruments for the instant detection and quantification of organic pollution in water, identification of misconnected sewers, pollution tracing to source and river surveys. Utilising UV fluorescence technology to increase the speed, accuracy and repeatability of monitoring with portable field equipment.

Water Pollution Monitoring

Portable Fluorimeter

• Measurement of organic pollutants in water giving BOD equivalence.
• Instant readings on site without laboratory analysis costs and timescale.
• Tracing pollutant sources back to origin.
• Data logging & remote monitoring capabilities.
• Can be used by unskilled operators for routine monitoring.
• No consumables or reagents required

Application of the STS - SMF4 Fluorimeter

STS have produced the fully portable SMF4 Fluorimeter which allows instant quantification of Tryptophan, a surrogate for BOD, in water samples on site, allowing immediate decisions to be taken regarding water quality and control actions.

This technique simplifies and quantifies investigations into cross connections in sewers and recycled water systems, illegal discharges to surface waters and monitoring consent agreements. Operation and control of the instrument has been streamlined so that it can be used by non scientific staff.

The great benefit of the SMF4 is the speed of measurement enabling large surveys to be undertaken, recorded and analysed within a matter of hours, whilst also giving real time information on immediate pollution issues.

The design of the SMF4 draws heavily on the research carried out by Prof Andy Baker and his team at the University of New South Wales & formerly of Birmingham University (UK), who showed that Tryptophan is an excellent indicator of anthropogenic pollution and that its measurement by fluorescence was straightforward. Further research allowed strong correlations to be made between tryptophan and the standard Biological Oxygen Demand test, but with an instant result rather than a 5 day delay. (research papers are listed at the end of this document)

The graph below shows an example of the established correlation between BOD and SMF4 fluorescence intensity counts.

The instrument is capable of detecting concentrations of BOD equivalence as low as 1 BOD and up to 300+ BOD (with very high BOD?s some dilutions may be necessary to reduce turbidity) giving the instrument a very wide scope of use from Final Effluent analysis through to direct pollution from farm, industrial and household point source

Technical Specification for the STS - SMF4 Fluorimeter

Instrument Dimensions
?Size including carrying handle 18 x 30 x 15 cm
?Weight including batteries 2.2 Kg
?Splash proof sealing

Instrument Features
• LCD Display 93 x 70 mm
• Dimmable Backlight
• Internal rechargeable batteries
• Alphanumeric & Navigation Keypads
• Cell holder and Cover
• Internal Memory data capture of up to 2000 sample records
• Automated serial sample data recording

Instrument Function Menu

The instrument menu is accessible from the keypad and offers the following user defined settings:

Data Input-will allow specific sample number and location information to be attached to a sample record. Each sample captures a unique ID number, date, time and reading in addition to the 2 user definable parameters.

Set Sensitivity-the instrument has 3 sensitivity settings accommodating a wide range of Tryptophan concentrations. Concentrations can be measured from 0.025ppm to 25.0ppm Tryptophan.

Backlight-may be set to desired intensity as light conditions require and will automatically be turned off after 5 minutes of inactivity to preserve battery life.

Auto Sampling-using a flow cell and pump the instrument may be set up to carry out a series of measurements over a specified period at user defined intervals. The results may be written to either the internal memory or to an external data logger.

The internal memory is capable of storing approximately the following:

1.3 days sampling at 1min intervals
20 days sampling at 15min intervals
83 days sampling at 1hr intervals
250 days sampling at 3hr intervals

Internal Memory-may be downloaded via an RS232 port. A 9 pin RS 232 to RS232 / USB output is provided to connect the SMF4 to either a PC or data logger.? PC requires Windows 98/2000/XP/7. The internal memory may also be cleared using the download function.

Set Date/Time-date and time are set in dd/mm/yy and hh/mm

Battery Information

The SMF4 is powered by NiMH rechargeable batteries, which give a useful operating period of approx 30hrs with the backlight on. When logging in sleep mode at hourly intervals the battery life is approximately 4 weeks. Approx 8hrs full recharge time required using provided charger.
Battery life is shown by a battery level indicator icon on the LCD display.

Sample Cell

Cell holder accepts standard fluorescence cells of 10 x 10 x 40 mm
Cell holder and cover will accommodate flow through cells for auto sampling.

N.B. The information contained in this entry is provided by the above supplier, and does not necessarily reflect the views and opinions of the publisher