TOXICITY OF ORGANIC CHEMICALS TO EMBRYO-LARVAL STAGES OF FISH potx

... altered test responses. Numerous classes of organic compounds were found to be highly toxic and teratogenic to developmental stages of fish. Of eleven compounds tested, those which proved most toxic to eggs, embryos, and early ... organic compounds and provided fish embryo-larval toxicity data for a number of important classes of organic trace contaminants. Chem...

Ngày tải lên: 05/03/2014, 20:20

... no surprise that aged chemicals are resistant to degradation compared to freshly added chemicals (25, 27, 97, 98) and that degradation of freshly added chemicals often tails off to leave a resistant ... 06504-1106 The use of equilibrium expressions for sorption to natural particles in fate and transport models is often invalid due to slow kinetics. This paper reviews recen...

Ngày tải lên: 28/03/2014, 20:20

... low toxicity to crustaceans. However, it is moderately toxic to algae (LC 50 ca. 20 to 30 mg/L) and acutely toxic to fish, such as salmon (LC 50 s on the order of Literature Review of Organic ... <3.3). Due to their specific mode of action (plant hormone), they have low toxicity to fish and crustacea (EC 50 >>100 mg/L) and moderate toxicity to alg...

Ngày tải lên: 14/02/2014, 03:20

... into hexane, and processed through col- umns containing 300 milligrams (mg) of silica gel to remove color and any precipitate. A total of 10 mL of hexane was used to transfer the samples to ... feature of the EAF is that it is relatively constant for all chemicals that have the same rate-limiting barrier to uptake, allowing PRC data to be applied to a range of che...

Ngày tải lên: 14/02/2014, 08:20

... factor, which is equal to the ratio of the volume of this water and the volume of the pores in the soil to be flushed. The time needed and the amount of water (flush factor) are estimated based ... goal of a field investigation is to determine the extent of the contamination. In an early stage of the investigation, not much effort is given to the collection of data t...

Ngày tải lên: 14/02/2014, 08:20

... objective is biomonitoring with trees. 16 Exposure modeling To cover the vast amount of chemicals present ubiquitously, predictive tools are needed to indicate compounds of possible concern ... Uptake of organic chemicals in plants Paper II aims at determining the potential for accumulation of organic chemicals from soil in food crops. Many studies have been perform...

Ngày tải lên: 05/03/2014, 20:20

... because of the risk of EXPLOSION with acetone vapour. Organic impurities have been removed from acetone by adding 4g of AgN03 in 3Oml of water to 1L of acetone, followed by lOml of M NaOH, ... aqueous EtOH. Purification of Organic Chemicals 69 Aceto-p-toluidide [103-89-91 M 149.2, m 146O, b 307°/760mm. Crystd from aqueous EtOH. Acetoxyacetone (acetol aceto...

Ngày tải lên: 05/03/2014, 21:20

... so that subsurface monitoring is sufficient to ensure remediation. The purpose of this chapter is to identify the current state of our capa- bility to remediate organic chemicals in the vadose ... challenges to even our most advanced capabilities. This spectrum of outcomes to the remedial process is a result of the diversity of conditions encoun- tered at contaminated...

Ngày tải lên: 14/03/2014, 19:20

Ngày tải lên: 22/03/2014, 14:20

... been developed to estimate the rate constants for organic chemicals in fish [15]. This allows us to apply the model to fish, which is often a biological entity of interest because of the high trophic ... QSAR provides estimates of the bioaccumulation potential of organic chemicals in higher trophic level fish species of aquatic food webs. The QSAR can be adapted...

Ngày tải lên: 22/03/2014, 14:20