Odour Threshold Investigation 2012 - Bay of Plenty Regional Council

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Panellist means Figure 7.12 t-test results (with box plots) for a range of averaging levels and locations. 7.5.6 Other relationships and data characteristics Trends over sessions Determining a trend over sessions for individual panellists was outside the initial brief of this project and is ultimately focussed more on the methodology aspect of the investigation rather than the determination of odour thresholds. Figure 7.13 shows the pattern of test results per panellist per session to see if a dominant pattern existed which could warrant further investigation. Figure 7.13 H 2 S threshold range per session, all panellists. Figure 7.13 shows a wide range of values recorded per session. Linear best fit analysis results in a negative slope relationship which would suggest a reduction over sessions, but the range of values per session overshadows this relationship. 44 Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012
Preliminary investigation of session trends are shown in Figure 7.14 where individual graphs per panellist are presented. These show the wide variability in trends and a number of cases where only 1 or 2 data points are available, thus undermining the credibility of such an exercise. Figure 7.14 Trends per panellist per session (blue – Rotorua, red – Whakatāne). Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012 45
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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 58 and 59: The original concept behind the tes
Page 60 and 61: Figure 7.16 Frequency plots - perce
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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