Odour Threshold Investigation 2012 - Bay of Plenty Regional Council

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Seigel et al 32 undertook measurement of H 2 S at 32 sites within Rotorua City. “Metronics Rotorod Colortec” asbestos pads treated with lead acetate were used to obtain hourly spot measurements over a 12 hour daily measurement window. Values ranged from
Figure 4.2 Seasonal diurnal patterns recorded at Ti Street, Rotorua Source or near source measurements In Rotorua there have been a number of projects looking at levels of H 2 S. Finlayson 40 investigated soil gas levels which showed an isolated but significant concentration zone at Arikikapakapa and a north/south alignment of zones of higher concentration (20,000 – 200,000 ppm), that starts at the edge of Whakarewarewa, proceeds north with increasing concentrations and a greater area of significant gas emissions, terminating at Government Gardens. Indoor H 2 S measurements were undertaken by Durand & Scott 41 . The primary means of gas entry was directly from the ground through the floors, walls, and subsurface pipes. Indoor vents were located and found emitting up to approximately 200 ppm H 2 S, concentrations high enough to present an acute respiratory hazard to persons close to the vent (e.g. children playing at floor level). These confined space levels are significantly higher than ambient levels. Smid et. al 42 reported on direct source measurements from 38 geothermal features including fumaroles, acid pools, alkaline springs, collapsed craters, mud pools, mud cones, and warm ground. H 2 S gas concentrations in parts per million (ppm) were recorded using a personal H 2 S monitor, the Dräger Pac 7000 43 , calibrated with a data logger interval set at 10 seconds. H 2 S gas readings were taken at the surface/entry of the feature, 0.5 meters above the surface/entry, and 1 m above the surface/entry. Overall, features emitted concentrations of H 2 S gas from 0 to 100+ ppm at the feature entries. At a height of 0.5 m above feature surface/entry, H 2 S readings ranged from 0 to 57 ppm. At 1 m above feature surface/entry, the H 2 S measurements ranged from 0 to 20 ppm. 40 Finlayson, J.B., 1992, A soil gas survey over Rotorua Geothermal Field, Rotorua, New Zealand, Geothermics, Vol. 21 No. 1/2, ISSN 0375-65058. 41 Durand, M. & Scott, 2005, Geothermal ground gas emissions and indoor air pollution in Rotorua, New Zealand, Sci. Total Environ, 345, 69-80. 42 Smid, E. R., Howe, T. M. & Lynne, B. Y.,2010, H 2 S Pilot Study, Rotorua, New Zealand, Institute of Earth Science and Engineering, New Zealand, Report 11-2010.1, April 2010. 43 Electrochemical diffusion device. Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012 15
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 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 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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