Odour Threshold Investigation 2012 - Bay of Plenty Regional Council

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Figure 7.16 Frequency plots - percentage of data points in relation to 7 µg/m 3 . Residence time versus threshold The residence time of the Rotorua panellists was also recorded. As shown below, there was a wide level of ‘historical’ exposure (this was not manipulated in any way as a real life snapshot of the population was required for this non laboratory type investigation), but no pattern as to a relationship with average measured threshold was found. 7.6 n-butanol results n-butanol is normally used as a screening gas for identifying suitable panellists for laboratory based olfactometry exercises. AS/NZS 4323.3:2001 requires that each panellists’ threshold for n-butanol has to fall within 0.5 and 2 times the accepted reference value (132 µg/m 3 or 40 ppb), therefore within the range of 66 to 264 µg/m 3 . The calculated geometric means for the n-butanol results obtained in this study are 138 and 167 µg/m 3 for the Whakatāne and Rotorua groups respectively. The relationship with the standard requirements was not investigated on an individual panellist basis as the theory behind this project was to use a non-screened panel which would provide a more realistic real world scenario. A quick summary of the n-butanol results are shown in the histograms in Figure 7.16. Once again a negatively skewed raw dataset was obtained which was normalised by performing a log normal transformation. The relationship between the two gases used in this investigation per panellist (Figure 7.17) shows no strong relationship and thus highlights the complex nature of odour recognition and interplay of contaminants on an individual by individual basis. 48 Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012
Untransformed Log 10 Transformed All data Whakatāne Rotorua Figure 7.16 Distribution patterns for n-butanol. Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012 49
Page 1:
A review of odour properties of H 2
Page 5:
Acknowledgements Dr Bruce Graham fo
Page 8 and 9:
In relation to the second question
Page 10 and 11: 6.5 Equipment 29 6.6 Requirements o
Page 12 and 13: Figure 7.10 Graphical summary of th
Page 14 and 15: The standardisation of DDO in Austr
Page 16 and 17: Figure 2.1 Odorant receptors and th
Page 18 and 19: Figure 2.3 Relative slope of odour
Page 21: Part 3: H 2 S health effects The pr
Page 24 and 25: such as composting can provide very
Page 26 and 27: Seigel et al 32 undertook measureme
Page 28 and 29: Rotorua District Council also under
Page 30 and 31: Kevern 56 undertook several surveys
Page 33 and 34: Part 5: H 2 S threshold information
Page 35 and 36: The American Industrial Hygiene Ass
Page 37: Earlier summaries of data in relati
Page 40 and 41: The results generated by the olfact
Page 42 and 43: At each round of the testing proces
Page 44 and 45: 6.7.2 n-Butanol vapour The standard
Page 46 and 47: 7.1.2 Ambient H 2 S levels No H 2 S
Page 48 and 49: Residence time for Rotorua panellis
Page 50 and 51: Figure 7.7 Example of incomplete ro
Page 52 and 53: A display of the “round” values
Page 54 and 55: Figure 7.11 Log 10 mean session dat
Page 56 and 57: Panellist means Figure 7.12 t-test
Page 58 and 59: The original concept behind the tes
Page 62 and 63: Figure 7.17 Scatterplot showing n-b
Page 64 and 65: Several types of analysis of the gr
Page 66 and 67: Figure 8.1 Updated H 2 S threshold
Page 69: Appendix 1 - Olfactometer calibrati
Page 73 and 74: Appendix 3 - Dr Ray Littler analysi
Page 75 and 76: Effect of elevated ambient H 2 S On
Page 77 and 78: Figure 4 Untransformed is non-norma
Page 79 and 80: 14 Histogram of MnH2S_Whakatāne 12
Page 81: Histogram of Mn butanol Lognormal R
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Odour Threshold Investigation 2012 - Bay of Plenty Regional Council

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