PT  - JOURNAL ARTICLE
AU  - John M. Harvey
AU  - C. Max Harris
AU  - Thomas A. Hanke
AU  - Preston L. Hartsell
TI  - Sulfur Dioxide Fumigation of Table Grapes: Relative Sorption of SO<sub>2</sub> by Fruit and Packages, SO<sub>2</sub> Residues, Decay, and Bleaching
AID  - 10.5344/ajev.1988.39.2.132
DP  - 1988 Jan 01
TA  - American Journal of Enology and Viticulture
PG  - 132--136
VI  - 39
IP  - 2
4099  - http://www.ajevonline.org/content/39/2/132.short
4100  - http://www.ajevonline.org/content/39/2/132.full
SO  - Am J Enol Vitic.1988 Jan 01; 39
AB  - Table grapes are fumigated with SO2 to control decay during storage and marketing. The efficacy of the treatment is affected by the type of packaging material used. Most fumigation schedules in commercial use were developed for grapes packed in wooden or wood/kraft veneer (WKV) boxes. In laboratory experiments, grapes packed in expanded polystyrene foam (EPF) boxes sorbed ca 50% less SO2 as did those in WKV boxes; grapes packed in fiberboard boxes sorbed ca 50% more SO2 than did those in WKV boxes. Adjusted fumigation dosages were developed that compensated for sorption by packaging materials and provided comparable concentration x time (CT) products in the fumigation chamber. Free SO2 residues in grapes packed in the three types of boxes and treated with the adjusted dosages were similar (0.11 - 0.13 µg/g); total SO2 residues were 2.3, 1.8, and 1.0 µg/g in grapes packed in WKV, EPF, and fiberboard boxes, respectively. All residues were below a proposed tolerance of 10µg/g. The adjusted schedules had comparable effects on decay control, stem condition, and bleaching of the berries.