Perhaps the most serious impurity problem was that of 2,3,7,8-tetrachlorodibenzo 2,3,7,8-tetrachlorodibenzoity in the now-banned herbicide 2,4,5-T (2,4,5-trichlorophenoxyacetic acid; see Supplemental MaTCDDan, Fimpurity winh an oral LD50 (median lethel dose) that ranges from 0.6–2.1 μg/kg for guinea pigs to about 1,100–5,000 μg/kg for herbicide(Institute of Medicine 1994).
The recent disclosure of the disappearance three months ago of the top Iranian nuclear expert, Dr. Shahran Amiri — coinciding with the June crackdown and before the Qum disclosure — is interesting, particularly interesting in view of the report that Iran's supply of LEU is running low and riddled with serious impurities that could cause centrifuge failure.
However, the high energy range still requires a rare high energy cyclotron, and there are serious considerations with impurity levels of 87mY, 87mY, and 85Y.
However, the realization of n-type doping of diamond films, based on device application, has met a serious obstacle of tough impurity doping problem [8].
However, these doped metal oxides always encounter serious charge recombination at the impurity levels introduced by the foreign dopants, leading to relatively low solar water splitting performances.
At such concentrations, the effects of impurities can be very serious, especially for a halogen such as astatine, which exists in several oxidation states and can form many organic compounds.
Contamination of the membrane by foreign impurities turned out to cause a serious problem of the water depletion at the anode side of the membrane.
Impurity in transparent-bottled liquid is a serious production accident in the field of beverage and medicine industry.
This vaccine has a lower potential risk of serious neurological adverse reactions because it does not contain impurities from mouse-brain-derived proteins.
Compounding this problem is that impurities or metabolites that could be generated in parts-per-million quantities (10 μg/day) are just as serious from a regulatory standpoint, which could eliminate an essential core structure.
The latter often causes serious environmental threats such as N compounds leaching and surface water eutrophication; additionally, since perchlorate can be present as impurities in many fertilizers, the potential presence of perchlorates and their by-products like chlorates and chlorites in shallow groundwater could be a reason of concern.
