Dynagard Environmental Review
The Kirkpatrick Group, Inc.
Since 1982, the Kirkpatrick name has been known for its contribution to wire rope maintenance worldwide. OEM
What is a Bio-Aquatic LC50 Test?
LC50 stands for the Lethal Concentration and how long it takes to kill 50% of the marine life being used for the test. The role of LC50 testing is to determine how environmentally safe a coating product is to organisms in a marine environment. Knowing the safety or toxicity levels of the product, you are considering is essential to meet environmental regulations such as the VGP introduced in 2013.
Correctly interpreted, LC50 stands for the length of time (24, 48, or 96 hours) a particular marine species is exposed to a contaminant, such as a Wire Rope coating product. LC50 testing evaluates how many parts per million (PPM) it takes to kill 50% of the marine test organisms in a given time frame. For informational purposes: Our Environmental Dynagard Blue ? has a Bio-Aquatic LC 50 rating 250 x greater than the VGP Requirement of 1,000 PPM (Liters) and Our Dynagard “E” ? has an LC 50 Rating 20 x greater.
The higher the PPM rating within the test time frame, the safer the product is to the marine life to which it is exposed.
The Lower the PPM rating, the less environmentally friendly or safe the product is to marine life. Naturally, a 24-hour test period is less definitive than a 48-hour period. This distinction is worth considering when evaluating Bio-Aquatic data involving a Wire Rope Coating for your company or government branch.
Definition of the Specimens used for the Dynagard? Environment Testing:
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Saltwater Americamysis Bahia: A microscopic shrimp-like crustacean of the order Mysida, the opossum shrimps. It is native to estuarine waters in Texas and Florida in the United States. It is often referred to in the literature as Mysidopsis Bahia, and is widely cultured and used in the laboratory for toxicology testing for its size and high sensibility to pollutants in a marine environment. The use of this specimen has set the standard for Saltwater Marine testing worldwide.
Freshwater Ceriodaphnia Dubia: A tiny aquatic invertebrate used as an indicator organism to measure toxicity in freshwater environments. C. Dubia is considered to be a representative of Creek organisms at the bottom of the food web. Toxicity to this species is believed to indicate poor water quality. Diazinon and Chlorpyrifos have been identified as impairing water quality because they are occurring at levels toxic to Ceriodaphnia Dubia. These pesticides can cause toxicity to Ceriodaphnia even at very low levels.
The Fathead Minnow, Pimephales Promelas: A freshwater fish widely distributed in the United States usually found in brooks, ponds, and small lakes. The species is tolerant of high turbidity, high temperatures, and low oxygen concentrations.
Pimephales Promelas is the EPA recommended vertebrae species for freshwater chronic toxicity tests. In these tests, the larva is exposed for a predetermined period to different concentrations of effluent or to receiving water. Test results are based on the survival and weight of the larva.