Plant protecting and regulating compositions – Plant growth regulating compositions – Aquatic plant regulator
Patent
1998-10-14
2000-06-06
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Aquatic plant regulator
504157, A01N 2508, A01N 3712
Patent
active
060718595
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to red tide eliminating compositions, in particular controlled-release red tide eliminating compositions which disperse in a short period and at a uniform concentration and which have excellent red tide eliminating effect. The present invention also relates to methods for eliminating red tide.
BACKGROUND ART
Known methods for eliminating red tide include those using hydrogen peroxide (Suisan Zoshoku), 39 (2), 189-193 (1991)). However, the effects of these methods remain to be improved.
Colloidal particles of clay minerals possess a property of agglomerating and adsorbing suspended matter in the water, so that utilizing this property, clays are also used as red tide eliminating agents. Clays are basic units of soil constituting the earth, and thus can be found everywhere and readily available. Particles of clays are plate crystals and form various clay minerals because of the difference in the crystal lattices plate number of silicate and alumina, or substitution of metal ions. This difference in the structure result in different capabilities of eliminating organisms by absorption. Accordingly, usable clays are restricted in origin and species.
Also known are methods which uses surfactants. Examples of such surfactants include alkylbenzenesulfonates (ABS), linear alkylbenzenesulfonates (LAS) (Bulletin of Environmental Contamination & Technology, 18, (3), 291 (1977)), or salts of an alkyl ether sulfuric acid ester to be used in combination with natural extracts (Japanese Unexamined Patent Publication No. 66603/1991). However, ABS and LAS are inferior in respect of bio-degradability, aquatic toxicity or hard water resistance, and thus are not preferable.
Generally, red tide eliminating compositions are required to have the following characteristics: applied,
These requirements are all important, but no red tide eliminating agent has been proposed so far which fully satisfies such problems.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a novel and useful composition for eliminating red tide planktons, which is not only safe but also practically usable.
The red tide eliminating composition of the invention comprises 1 to 70 wt. % of a (polyoxyalkylene) fatty acid ester represented by the formula (1) (hereinafter referred to as "the present surfactant") and 99 to 30 wt. % of an adsorbent. alkenyl group, n represents an integer of 1 to 30, and AO represents a C.sub.2-4 alkylene oxide.
More specifically, the present invention provides a red tide eliminating composition comprising: formula (1) alkenyl group, n represents an integer of 1 to 30, and AO represents a C.sub.2-4 alkylene oxide, and said at least one (polyoxyalkylene) fatty acid ester (a) represented by the formula (1) and said at least one adsorbent (b), said at least one (polyoxyalkylene) fatty acid ester (a) represented by the formula (1) is present in an amount of 1 to 70 wt. % and said at least one adsorbent (b) is present in an amount of 99 to 30 wt. %.
The present inventors prepared various red tide eliminating compositions in an attempt to solve the above problems, and carried out extensive research on their characteristics. Consequently, they found the following facts and accomplished the present invention based on these findings. structure and an adsorbent as essential components, in which the essential components are present in the specific proportions, can effectively eliminate red tide planktons occurring in bodies of seawater, such as Chattonella, Gymnodinium, Heterosigma and the like, when applied to areas affected by such red tide planktons. the desired range of seawater or freshwater in a short time. Specifically, use of the surfactant improves wettability of the adsorbent particles and increases the rate of diffusion of the particles in the vertical direction, with the result that the composition can reach a desired depth of 4 to 7 m in a short time. dispersed and therefore is effective even at a low concentration. Specifically, use of the adsorbent enabl
Nakanishi Mikio
Ogawa Yasuaki
Uemura Kenji
Clardy S. Mark
Nakanishi Mikio
New Japan Chemical Co. Ltd.
Nichimen Corporation
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