solutions for your environment PATTLE DELAMORE PARTNERS LTD

©PDP 3 May 2023

P A T T L E D E L A M O R E P A R T N E R S L T D solutions for your environmentP A T T L E D E L A M O R E P A R T N E R S L T D solutions for your environment

The Use and Limitations of Field Portable XRF for Contaminated

Site Techniques.Andrew Rumsby and Graeme ProffittPattle Delamore Partners LtdAuckland

WasteMINZ Conference 2015Rotorua

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P A T T L E D E L A M O R E P A R T N E R S L T D solutions for your environmentP A T T L E D E L A M O R E P A R T N E R S L T D solutions for your environment

Ideal Samples

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Results from Unprepared Samples

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Results for Unprepared Samples

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P A T T L E D E L A M O R E P A R T N E R S L T D solutions for your environmentP A T T L E D E L A M O R E P A R T N E R S L T D solutions for your environment

P A T T L E D E L A M O R E P A R T N E R S L T D solutions for your environmentP A T T L E D E L A M O R E P A R T N E R S L T D solutions for your environment

Types of Samples to be Avoided

• Samples which a high percentage of gravels in them (need to be sieved)

• Very wet samples should be avoided

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Indicative Detection Limits of FP-XRF (using 60 seconds per filter)

ElementHuman health

or environmental

concern?

Typical FP-XRF detection limit

(mg/kg)Ease of comparison to guidelines/standards

Antimony, (Sb) Yes 20

Questionable depending on guideline adopted for rural lifestyle/residential (10%

produce ingestion), laboratory validation testing

recommended.

Arsenic, (As) Yes 7

Questionable for rural lifestyle /residential (10%

produce ingestion), laboratory validation testing

recommended.

Cadmium, (Cd) Yes 12

Not valid for rural lifestyle/residential (10%

produce ingestion) investigations. Valid for high density residential land-use,

commercial/industrial

Copper, (Cu) Yes 15 Usually valid

Lead, (Pb) Yes 8 Usually valid

Zinc, (Zn) Yes 12 Usually valid

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Some Elements which XRF are not so good for Human Health Investigations

(Residential)

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Cadmium Interference

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Case Study• 1.5 ha rural site• Used for organically growing

flowers• Owner says no pesticides use on

land• Preliminary testing indicates

elevated As and Pb concentrations• 45 houses will be developed on-

site.• CLMG#5 says 25 samples should

be collected

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Insert Title – In Slide Figure

Case Study

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Take Home Points

• XRF is a good tool for some elements• Prepared samples results give good agreement with

lab samples results• Unprepared samples may not meet the 0.9 r2 criteria• But by understand the limits of uncertainty in XRF data

you can target lab analysis to samples which need it.

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Acknowledgments

PDP would like to thank Graham Corban of Hill Labs for the kind permission to use data from his

study into the “Effects of Sample Preparation on the Accuracy of

Total Recoverable Heavy Metals”

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Questions?

solutions for your environment PATTLE DELAMORE PARTNERS LTD

©PDP 3 May 2023