title: Sorption and desorption characteristics of methyl bromide during and after fumigation of pine (Pinus radiata D. Don) logs.
abstract: BACKGROUND
  The sorption and desorption characteristics of methyl bromide (MB) were determined during and after fumigation of recently harvested pine (Pinus radiata D. Don) logs. The effects of dose (48 or 120 g m-3), degree of bark cover (0, 50 or 100%) and end-grain sealing (sealed or unsealed) on sorption and desorption were determined over time.
  
  
  RESULTS
  Sorption of MB was proportional to the dose applied and dependent on the amount of end-grain sealed. After 16 h, an average of 70.7 ± 2.5% of the initial concentration remained in the treated space when end-grains were sealed, whereas only 47.3 ± 2.5% remained when unsealed. During aeration, MB was released from logs, initially ranging from 2.8 to 8.8 g · h m-3, depending on the treatment. The rate of desorption quickly decreased during aeration.
  
  
  CONCLUSIONS
  The surface area of a log is the most important factor influencing MB sorption and desorption rates, with greater surface area resulting in greater (de)sorption rates. Sorption data can now be combined with insect toxicity data to estimate a minimum effective dose of MB for further evaluation, while desorption data can be combined with fumigant plume modelling to assess worker safety. © 2016 Society of Chemical Industry.
authors.affiliation: The New Zealand Institute for Plant and Food Research Limited, Palmerston North, New Zealand.
authors.forename: Matthew
authors.initials: M
authors.lastname: Hall
authors.affiliation: The New Zealand Institute for Plant and Food Research Limited, Palmerston North, New Zealand.
authors.forename: Adriana
authors.initials: A
authors.lastname: Najar-Rodriguez
authors.affiliation: The New Zealand Institute for Plant and Food Research Limited, Palmerston North, New Zealand.
authors.forename: Anthony
authors.initials: A
authors.lastname: Adlam
authors.affiliation: The New Zealand Institute for Plant and Food Research Limited, Palmerston North, New Zealand.
authors.forename: Alistair
authors.initials: A
authors.lastname: Hall
authors.affiliation: The New Zealand Institute for Plant and Food Research Limited, Palmerston North, New Zealand.
authors.forename: Don
authors.initials: D
authors.lastname: Brash
mesh_terms: D004305:Dose-Response Relationship, Drug; D005651:Fumigation; D006842:Hydrocarbons, Brominated / Q000737:chemistry* / Q000494:pharmacology; D028223:Pinus / Q000737:chemistry* / Q000187:drug effects
chemical_list: D006842:Hydrocarbons, Brominated; C005218:methyl bromide
keywords: forest insects; ozone; quarantine; treatment