Field Efficacy of Nicotiana tabacum L. var Virginia Extract against Coffee Borer Beetle (Hypothenemus hampei) Attacking Coffee Berries in Plantation Area

Table 3

Residual assay of EHRE-Nt^†.

Hazardous chemicals	Results	Methods
(1) Organochlorine	Negative	TLC^‡
(2) Organophosphate	Negative	TLC
(3) Carbamate	Negative	TLC
(4) Arsenic (As)	<1 μg/g	AAS–HVG^§
(5) Pb	Negative	AAS–O2-C2H2
(6) Cadmium (Cd)	Negative	AAS–O2-C2H2
(7) Hg	Negative	AAS–MVU^⊥

^†The ethanolic heat reflux extract of N. tabacum L. var Virginia origin of Ponorogo. ^‡Thin-layer chromatography. ^§Atomic absorption spectroscopy–hydride vapour generation. ^⊥Atomic absorption spectroscopy–mercury vapour unit.