Table II-11 and Figure II-9 show the estimated breakdown of natural and anthropogenic sources of mercury in New Zealand. The results have found that there is a 52:48 split, with a slightly greater proportion of emissions being generated from natural sources.
|Natural Sources||kg/yr||% of Natural||% of Total Emissions|
|Volatilisation of Mercury from Soils||500||33||17|
|Anthropogenic Sources||kg/yr||% of Anthropogenic||% of Total Emissions|
|Extraction and use of fuels/energy sources||800||54.5||26|
|Primary (virgin) metal production||30||1.9||1.0|
|Production of other minerals and materials with mercury impurities||14||1||0.5|
|Intentional use of mercury in industrial processes||0||0||0|
|Consumer products with intentional use of mercury||260||18.5||8.9|
|Other intentional products/process uses||30||2.3||1.1|
|Production of recycled metals ("secondary" metal production)||0||0||0|
|Waste deposition/landfilling and waste water treatment||180||13||6|
|Crematoria and cemeteries||120||8.7||4.2|
|Identification of potential hot-spots||Not quantifiable||Not quantifiable||Not quantifiable|
|Total Natural and Anthropogenic Sources||2,900|
Note: Emission quantities have been rounded to two significant figures.
Figure II-9 : Natural versus anthropogenic sources of mercury in New Zealand
Shown as a pie-chart of kilograms of mercury per year. Pie chart includes: volcanoes – 28%; extraction and use of fuels/energy sources – 26%; volatilisation of mercury from soils – 17%; consumer products with intentional use of mercury – 9%; geothermal areas – 7%; waste deposition/landfilling and waste water treatment – 6%; crematoria and cemeteries – 4%; other intentional products/process uses – 1%; primary (virgin) metal production – 1%; production of other minerals and materials with mercury impurities – 1%; production of recycled metals (“secondary metal production”) – 0%; waste incineration – 0%; intentional use of mercury in industrial processes – 0%; identification of potential hot-spots – non-quantifiable.
Figure II-10: Summary of natural versus anthropogenic mercury emission sources
Illustrated as a pie-chart, includes: anthropogenic – 48%; natural – 52%; and historical (non quantifiable) – 0%.