Environmental Laboratory Conclusion
The importance of reagent water quality for toxic element analyses was discussed and low levels of elements in ultrapure water produced by a Milli-Q®
water purification system were
demonstrated. Laboratories performing trace element analysis can rely on Milli-Q®
ultrapure water purification systems to meet
their stringent requirements for the highest purity water for their experiments. Choosing ultrapure water from a Milli-Q®
system for
trace element analyses will help to ensure the generation of high quality data.
References
1. Official Journal of the European Communities, Council Directive 98/83/EC of 3 November 1998.
http://eur-lex.europa.eu/LexUriServ/LexUriServ. do?uri=OJ:L:1998:330:0032:0054:EN:PDF
2. Canadian Environmental Quality Guidelines, Summary Table.
http://st-ts.ccme.ca/
3. European Union Urban Waste Water Treatment Directive, Council Directive 91/271/EEC.
http://eur-lex.europa.eu/LexUriServ/LexUriServ. do?uri=CONSLEG:1991L0271:20081211:EN:PDF
4. World Health Organization, Guidelines for drinking-water quality, fourth edition, (2011), Chapter 8 Chemical Aspects, p 170.
http://www.who.int/water_sanitation_health publications/2011/9789241548151_ch08.pdf
5. IS 3025 (Part 04): Method of Sampling and Test (Physical and Chemical) for Water and Wastewater, Part 04: Colour
Author Contact Details Anastasia Khvataeva-Domanov1
(First Revision).
http://archive.org/stream/gov.law.is.3025.04.1983/ is.3025.04.1983_djvu.txt
6. S. Su, B. Chen, M. He, B. Hu, Talanta, 123, 2014, 1–9.
7. Finnish Ministry of the Environment, Threshold of toxic compounds and metals in soil (Maaperän kynnys- ja ohjearvojen määritysperusteet),
Suomen Ympäristö, 23, 2007, p.96.
http://www.ymparisto.fi/download/noname/%7BC633F084-8595- 4032-BDD8-EFD539D4AED1%7D/91488
8. I. Rodushkin, E. Engstrom, D.C. Baxter, Anal Bioanal Chem., 396, 2010, 365-337.
9. N. Ishii, S. Mabic, Optimal Water Quality for Trace Elemental Analysis, Merck, Lab Water Application Note, (2011).
10. A. Khvataeva-Domanov, G. Woods, S. Mabic, Poster: Choosing optimal high purity water source in accordance to ICP-MS application needs and laboratory environment, Winter Conference on Plasma Spectrochemistry 2014, January 6 – 11 on Amelia Island, Florida, USA.
Table 1. The levels of elements in ng/L in freshly produced ultrapure water measured under normal laboratory conditions (not in clean room).
11
, Juhani Virkanen2
, Glenn Woods3
1. Merck, Lab Water, Saint-Quentin-en-Yvelines, France 2. University of Helsinki, Helsinki, Finland 3. Agilent Technologies Ltd., Stockport, UK 4. Merck, Lab Water, Feltham, UK • Web:
www.merckmillipore.com
, Pratiksha Rashid4
, Stephane Mabic1
4th generation of OPTIC Multimode inlet for gas chromatography
OPTIC from GL Sciences is a highly advanced gas chromatograph multimode inlet system with sophisticated temperature and gas flow control that can be used for the most demanding GC analyses. OPTIC has a long history starting from 1992. The current version, OPTIC-4, can be used for hot, cold, large volume and on-column injections, in-liner derivatisation, thermal desorption, pyrolysis and much more. Dirty, solid or liquid samples can be analysed using Difficult Matrix Introduction (DMI) technique. With DMI, a sample is introduced into a small micro-vial placed inside an OPTIC liner. In addition, the OPTIC controller is capable of a Deans’ switch or flow modulator control. An optional cryogenic trap with the fast heating ramp rate is also a valuable feature. The patented low thermal mass design of the inlet body together with direct resistive heating provides fast linear temperature programming up to 600 °C at rates as high as 60 °C/sec.
With the OPTIC-4, an analyst can introduce into GC a wide range of samples including the ones containing matrix or thermally labile compounds. The samples can also be water based or solids. Automated solvent venting procedure based on the standard solvent sensor in the split line makes the large volume injections as easy as the industry standard split or splitless.
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www.envirotech-online.com IET November / December 2018
Pressure insensitive mass flow controller EL-FLOW®
Prestige, the newest generation of Bronkhorst Mass Flow Meters/
Controllers for gases, can now be equipped with an on-board pressure sensor. In combination with the ‘Differential Temperature Balancing’ sensor technology and an incorporated gas database with physical properties, the instrument automatically compensates for inlet pressure variations. As a result, the accuracy and control stability will not be affected by these pressure changes. Next to an improved yield of the customer’s process, additional components for line pressure control will no longer be required.
The Multi Gas / Multi Range functionality of the EL-FLOW® Prestige enables the
user to select any of the installed gases and to adjust the measuring range within the boundaries of the device. Also the dynamic behaviour of the mass flow controller can easily be tuned on site, by adjusting the controller speed parameters. These settings can be changed using our free software tools FlowTune™ or FlowPlot™. The last mentioned tool can also be used for device diagnostics or alarm and counter settings.
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Exposure to unwanted chemical emissions are an unfortunate reality when working in a lab. Even if you can’t smell them, Erlab’s Halo laboratory-grade molecular air filtration system can.
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Halo is working 24/7 to clean the air in the lab. Once vapours are detected, Halo will capture them in Erlab’s proprietary carbon filtration technology. After adsorbing the molecules that cause unwanted odours, clean air is returned back to the room through low-disruptive side vents.
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Healthier Air in the Lab
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