INVESTIGADORES
BARTOSIK Ricardo
congresos y reuniones científicas
Título:
Phosphine Concentration Change During Fumigation in Hermetic Plastic Bags.
Autor/es:
LEANDRO CARDOSO; RICARDO BARTOSIK; DAVID MILANESIO
Lugar:
Rosario, Argentina
Reunión:
Simposio; CIGR Section V International Symposium; 2009
Institución organizadora:
Sección V de la CIGR
Resumen:
The goal of this experiment was to develop
and test a suitable methodology for treatment of grain stored in plastic bags
with phosphine. The treatment should guarantee a 200 ppm concentration of phosphine
during at least 5 days. Two plastic bags storing about 200 tonnes of dry wheat
each were used for the test, and a third bag was used as control. The first
treatment consisted of adding 1 tablet of aluminum phosphide per cubic meter (3
g/m3 of aluminum phosphide or 1 g/m3 of phosphine) and
the second treatment duplicated the dosage. The tablets were inserted each 5
linear meters along the bag. Additionally, cages containing live insects (Sitophilus oryzae) were inserted in
different locations of the bag. Phosphine concentration was daily measured in
different locations of the bag during 10 days. After the treatment, the cages
with insects were inspected and insect mortality was recorded. The main results
indicated that the treatment with the lowest phosphine concentration (1 g/m3)
was enough to reach the target concentration during 5 days in most of the bag.
The area close to the end of the bag resulted with lower than desired phosphine
concentration, indicating lack of airtightness in that sector. The areas closer
to the location where the aluminum phosphide tablets were inserted resulted
with higher phosphine concentrations than other areas. However, spacing the
application points each 5 m along the bag resulted in an efficient gas
distribution. Insect mortality was 100% in both treatments, while in the
control mortality was between 13 and 33%.