Triazines simazine

Cotterill [100] studied the effect of ammonium nitrate fertilizer on the electron capture or nitrogen specific gas chromatographic determination of Triazine plus other types of herbicide (Atrazine(2-chloro-4-ethylamino-6-isopropylamino, 1,3,5 triazine), Simazine (2-chloro-4.6 bis ethyl amino 1,3,5 triazine), Linuron (3,4,-chlorophenyl-l-methoxy-l-methyl urea), Metribuzin, Triallate and Phorate) residues in soil. 

Charpentier, M. and J. Pochon (1962). Bacteriestelluriques cultivant sur amino-triazine (simazine). Ann. Inst. Pasteur Paris, 102 501. 

Cast, Kniisli and Gysin reported on 2-chloro-4,6-bis(ethylamino)-.r-triazine (simazine), one of the most important triazine herbicides even today (Cast et ai,... 

The best known representatives are 2-chloro-4,6-bis ethYlamino)-j-triazine (simazine, 6), 2-chloro-4,6-bis(isopropylamino)-i-triazine (propazine, 7), 2-chloro-... 

Synonyms 2,4-Bis (ethylamino)-6-chloro-s-triazine 2-Chloro-4,6-bis (ethylamino)-s-triazine 2-Chloro-4,6-di-(ethylamino)-1,3,5-triazine 6-Chloro-N,N-diethyl-1,3,5-triazine-2,4-diamine 2-Di-(ethylamino)-6-chloro-s-triazine Simazin... 

Triazines. Triazine herbicides are one of several herbicide groups that are heterocycHc nitrogen derivatives. Triazine herbicides include the chloro-, methylthio-, and methoxytriazines. They are used for the selective pre-emergence control and early post-emergence control of seedling grass and broadleaved weeds in cropland (299). In addition, some of the triazines, particularly atrazine, prometon [1610-18-0] and simazine [122-34-9] are used for the nonselective control of vegetation in noncropland (2). Simazine may be used for selective control of aquatic weeds (2). 

Depending on the duration of heating yellow-green to dark green chromatogram zones were produced on a weakly colored background. The detection limits of the triazine herbicides cyanazine (h/Jf 25-30), simazine (h/Jf 30-35), atrazine (h/Jf 40-45), terbutylazine (h/Jf 45-50) and anilazine (h/Jf 60-65) were 20 ng substance per chromatogram zone. 

Ureides (e.g., diuron, linuron) and triazines (e.g., atrazine, simazine, ametryne) all act as inhibitors of photosynthesis and are applied to soil (see Figure 14.1 for structures). They are toxic to seedling weeds, which they can absorb from the soil. Some of them (e.g., simazine) have very low water solubility and, consequently, are persistent and relatively immobile in soil (see Chapter 4, Section 4.3, which also mentions the question of depth selection when these soil-acting herbicides are used for selective weed control). 

In general, triazines are pre- and post-emergence selective herbicides particularly effective on annual and perennial broadleaf and grassy weeds in corn, sorghum, cotton, soybeans, sugar cane, and a host of other fruit and cereal crops. Some have anti-fungicidal properties (e.g., anilazine), and some (e.g., simazine) can be used for... 

Supercritical fluid chromatography (SEC) was first reported in 1962, and applications of the technique rapidly increased following the introduction of commercially available instrumentation in the early 1980s due to the ability to determine thermally labile compounds using detection systems more commonly employed with GC. However, few applications of SEC have been published with regard to the determination of triazines. Recently, a chemiluminescence nitrogen detector was used with packed-column SEC and a methanol-modified CO2 mobile phase for the determination of atrazine, simazine, and propazine. Pressure and mobile phase gradients were used to demonstrate the efficacy of fhe fechnique. 

Thus it is significant that for such si/m-triazine herbicides as simazine, atrazine, etc., the health and hygiene MPC (toxicity to warm-blooded animals, including humans) and phytotoxic MPC (toxicity to plants) differ by more than an order of magnitude 0.2-0.5 mg/kg for warm-blooded animals, and 0.01 mg/ kg for plants [89]. Warm-blooded animals and arthropods have a difference in sensitivity to many pyretroids that can reach tens of thousands of times [90]. 

After use, herbicides decompose slowly, and so affect cultivated plants for many years. In 1990, investigations in many regions of the USSR detected herbicides phytotoxic effects, especially among the si/m-triazine class, on different cultivars in many varied situations [13]. These sym-triazine herbicides, such as protrazin, simazin, atrazine, metazin, and prometrin, were used in different oblasts of the Ukraine, Kirgizia, Kazakhstan, Russia and Moldavia in previous years, especially on corn. Residual herbicide aftereffects led to the suppression and death of crops such as winter wheat, oats, barley, rye, potatoes, beets and sugar beets, linen, onions, watermelons and other melons, and sunflowers. 

Six different individual data matrices were obtained for GW (gwi, gw2,..., gw6) but, in this case, rows (samples) were not common for all data matrices. A new GW data matrix was obtained after individual matrix concatenation containing 92 samples in total (see Fig. 7). In this case, the number of samples for the different sampling campaigns was not coincident (10, 16, 17, 15, 17, and 17 locations were sampled, from first to sixth campaigns respectively). Seven variables (all of them detected in SW as well) were measured in every GW sample an organophosphate compound (tributylphosphate), triazines (atrazine, desethylatrazine, simazine, and terbuthylazine), and APs (octylphenol and nonylphenol). 

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