Air Monitoring

THE USE OF STATISTICAL TECHNIQUES TO JUSTIFY THE RECOVERY OF CORRUPTED POLLUTION DATA

Oct 06 2014 Read 191 Times

Free to read

This article has been unlocked and is ready to read.

Download

ABSTRACT:

Data from continuous pollution monitoring can be corrupted due to many reasons, for example, by instrumentation failure, calibration faults or operator error. Although distorted, this data often exhibits an underlying relationship to the correct measurements. Operators intuitively feel that such data can be recovered by minor manipulation, and thus included in their compliance reports. However this can be hard to justify, and regulatory authorities have understandably preferred to regard data as either “good” or “bad”.

Borrowing terminology from self validating (SEVA) instruments, data may usefully beregarded as “blurred” where the underlying measurements can still be recovered. The justification of such data manipulation has been aided by three developments:

i) Much wider adoption of statistical techniques in industry (e.g. six sigma) has
improved the skills base;
ii) There is greater availability of software tools; and,
iii) An increase in logger memory capacity means more system and analyser
health diagnostics are now recorded.

As a contribution to the debate about “best practice” two detailed industrial case studies are presented to illustrate how several months of blurred data have been recovered, and how statistical techniques and diagnostic logs have been used to justify the data manipulation to the regulatory authorities. Case study one concerns calibration error. Case study two concerns instrument malfunction. To allow this paper to be used as a training aid, all techniques used are explained with examples.

Reader comments

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.

Post a Comment




Digital Edition

Asian Environmental Technology May 2019

May 2019

In This Editon Business News - Measuring the methane component of GHG emissions - Blackline Safety reports strongest quarter ever with revenue up 64% - Restek and LECO collaborate in worldw...

View all digital editions

Events

Achemasia

May 21 2019 Shanghai, China

PEFTEC 2019

May 22 2019 Rotterdam, Netherlands

SETAC Europe

May 26 2019 Helsinki, Finland

Caspian Power

May 29 2019 Baku, Azerbaijan

ASMS Conference

Jun 02 2019 Atlanta, GA, USA

View all events