Growth of welding aerosol particles in high relative humidity and particle deposition in the human respiratory airways

Fruit of Vitis vinifera cvs. Flame Seedless, Thompson Seedless and Black Monukka were fumigated with 4, 6 and 8 Deccodione Smoke Tables (DST) for 30 minutes. Fruit was stored at 32 F and high relative humidity. Decay control index, freshness of stems and bleaching around the capstem were recorded at 4, 8, 12 and 16 weeks of storage. Size of the aerosol particles was determined using an electrical aerosol analyzer. Fruit was analysed for Deccodione residues. Lower rates of the fungicide gave unsatisfactory decay control. Eight DSTs successfully controlled decay upto a period of 14 weeks. There was no bleaching of pigments commonly associated with sulfur dioxide fumigation. Majority of the aerosol particles were between 0.18 and 0.32 micrometers. Deccodione residues on the fruit were within the acceptable limits established for Deccodione. There was no perceptible difference in taste between treated and control fruit. This method of decay control could provide a viable alternative to sulfur dioxide fumigation.

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Hygroscopicity of Internally Mixed Ammonium Sulfate and Secondary Organic Aerosol Particles Formed at Low and High Relative Humidity

Environmental Science: Atmospheres ◽

10.1039/d1ea00069a ◽

2022 ◽

Author(s):

Patricia N Razafindrambinina ◽

Kotiba A Malek ◽

Joseph Nelson Dawson ◽

Kristin DiMonte ◽

Timothy M Raymond ◽

...

Keyword(s):

Organic Matter ◽

Relative Humidity ◽

Ammonium Sulfate ◽

Secondary Organic Aerosol ◽

Aerosol Particles ◽

Organic Aerosol ◽

High Relative Humidity ◽

Volatile Organic

Volatile organic matter that is suspended in the atmosphere such as α-Pinene and β-caryophyllene undergoes aging processes, as well as chemical and photooxidation reactions to create secondary organic aerosol (SOA),...

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ALTERNATIVES TO SULFUR DIOXIDE FUMIGATION FOR TABLE GRAPE STORAGE

HortScience ◽

10.21273/hortsci.31.6.919 ◽

1996 ◽

Vol 31 (6) ◽

pp. 919

Author(s):

A. Ahmedullah

Keyword(s):

Sulfur Dioxide ◽

Relative Humidity ◽

Aerosol Particles ◽

Table Grape ◽

High Relative Humidity ◽

Table Grapes ◽

Evaluation Time ◽

Fumigation Chamber

Clusters of four varieties of table grapes were packed in TKV lugs and fumigated with 4, 6, or 8 Deccodione Smoke Tables (DST) for a period of 30 minutes in a fumigation chamber. After fumigation, inoculum of Botrytis cineraria was placed among the berries in the clusters in predetermined locations. Fruit was stored at 0C and high relative humidity for up to 16 weeks. Fruit was examined at 4, 8, 12, and 16 weeks of storage. Decay control index, freshness of stems, and bleaching of pigments around the capstem was recorded at each evaluation time. Size of aerosol particles was determined. Satisfactory control of decay was obtained with 8 DSTs. Lower doses failed to give satisfactory decay control. Bleaching of capstems typically seen with sulfur dioxide fumigation was not noticed with DST fumigation.

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