No effects attributed to toxicity, as observed with BTri, occurred whereas concentrations above 6 mg/L already showed toxic effects for Vibrio fisheri[18].
Concentrations less than 0.05 M SDS resulted in great increase in the retention time, whereas concentrations higher than 0.2 M SDS decreased number of theoretical plates.
Therefore, total emissions from these surfaces are higher, whereas concentrations of substances in runoff can be higher from vertically exposed surfaces.
Concentrations of CaO, Na2O, K2O decrease markedly in the weathering products compared to the fresh bedrock source, whereas concentrations of Al2O3, Fe2O3, and MgO increase significantly.
Potassium concentrations in groundwater up to 10 mg/L are attributed to orthoclase or clay weathering, whereas concentrations above 10 mg/L may indicate external sources of K+ abundance (Rail 2000).
It is known that DO concentrations above 5 mg l−1 are rarely harmful to aquatic life, whereas concentrations below 2 mg l−1 are almost always detrimental and are considered a hypoxia threshold (Diaz and Rosenberg 1995).
This result is consistent with the report of Demain ([1986]), who showed that phosphate in the range of 0.3-300 mM generally supports extensive cell growth, whereas concentrations of 10 mM and above suppress the biosynthesis of many secondary metabolites.
Concentrations less than 6% resulted in a broad and less sensitive peaks and it was time consuming, whereas concentrations higher than 14% decreased number of theoretical plates for both drugs.
Yields of whole-plant and digestible DM and concentrations of starch and DM increased with maturity, whereas concentrations of crude protein, water-soluble carbohydrates, and neutral detergent fiber decreased.
The addition of low nanoparticle contents retarded the crystallization of the matrix, whereas concentrations equal or higher than 1.0 wt% increased both the crystallization temperature and degree of crystallinity compared to those of PPS/CF.
In the German Drinking Water Ordinance, for example the limits for magnesium and also for zinc were removed since a negative impact for human health was considered as very low, whereas concentrations of 0.2 mg l−1 for aluminum and iron and 2 mg l−1 for copper are not to be exceeded (Ordinance 2001).
