Abstract:
The invention is directed to compositions for the fumigation of soils, enclosed spaces, agricultural products and other commodities, etc., using compositions which decompose to form carbon disulfide and certain other biocidal materials. Such fumigation can be used to control bacteria, fungi, insects, nematodes, rodents, and weeds. A composition is provided which is an aqueous solution of ammonium, alkali metal or alkaline earth metal thiocarbonate or a mixture thereof, comprising an added base, the concentration of the added base being sufficient to produce a pH above 7 in the solution: These "thiocarbonates," include, without limitation, salts of trithiocarbonic acid and tetrathiocarbonic acid, compositions having empirical formulae intermediate to these acid salts (such as MCS 3.7 , wherein M is a divalent metal ion), and compositions containing substances in addition to thiocarbonates [such as a stabilized ammonium tetrathiocarbonate which contains ammonium sulfide, i.e. (NH 4 )- 2 CDS 4 (NH 4 ) 2 S]. The compositions are generally water soluble and can be prepared, stored, and used in aqueous solutions. The thiocarbonate solutions of the invention are stable during prolonged periods of storage in a closed container, exhibit a low vapor pressure, and are not flammable. For soil fumigation, thiocarbonates can be mixed with fertilizers to provide a multi-functional application.
Abstract:
The invention is directed to compositions for the fumigation of soils, enclosed spaces, agricultural products and other commodities, etc., using compositions which decompose to form carbon disulfide and certain other biocidal materials. Such fumigation can be used to control bacteria, fungi, insects, nematodes, rodents, and weeds. A composition is provided which is an aqueous solution of ammonium, alkali metal or alkaline earth metal thiocarbonate or a mixture thereof, comprising an added base, the concentration of the added base being sufficient to produce a pH above 7 in the solution: These "thiocarbonates," include, without limitation, salts of trithiocarbonic acid and tetrathiocarbonic acid, compositions having empirical formulae intermediate to these acid salts (such as MCS 3.7 , wherein M is a divalent metal ion), and compositions containing substances in addition to thiocarbonates [such as a stabilized ammonium tetrathiocarbonate which contains ammonium sulfide, i.e. (NH 4 )- 2 CDS 4 (NH 4 ) 2 S]. The compositions are generally water soluble and can be prepared, stored, and used in aqueous solutions. The thiocarbonate solutions of the invention are stable during prolonged periods of storage in a closed container, exhibit a low vapor pressure, and are not flammable. For soil fumigation, thiocarbonates can be mixed with fertilizers to provide a multi-functional application.
Abstract:
Viscous fumigant compositions comprise carbon disulfide precursors, such as thiocarbonates, xanthates, and dithiocarbamates, that decompose upon application to release carbon disulfide. The compositions exhibit an improved active life when applied, for example, to soil.
Abstract:
Aqueous thiocarbonate solutions are stabilized by the addition of base, sulfide and/or polysulfide and the stability and safety of the more concentrated solutions containing 1 weight percent or more equivalent CS₂ as a thiocarbonate are achieved as reflected by significant reduction of CS₂ partial pressure in such solutions. Such stabilized thiocarbonate solutions are useful for the control of pests in, e.g. soil, and for inhibiting nitrification.