. Acute and chronic toxicity to zooplankton of pure pentachlorophenol and a technical formulation : laboratory and field studies. Aquatic animals; Pentachlorophenol; Pentachlorophenol. Otygen at m 5, Seccni orsc values Secchi readings varied greatly among replicate corrals for both the controls and the PCP- treated corrals; however, greatest divergence between treatments occurred immediately after the pesticide was applied when there was greater transparency of water in the PCP-treated corrals (Figure 6). Mean concentration of oxygen in the water at a depth of m showed a decline in the
. Acute and chronic toxicity to zooplankton of pure pentachlorophenol and a technical formulation : laboratory and field studies. Aquatic animals; Pentachlorophenol; Pentachlorophenol. Otygen at m 5, Seccni orsc values Secchi readings varied greatly among replicate corrals for both the controls and the PCP- treated corrals; however, greatest divergence between treatments occurred immediately after the pesticide was applied when there was greater transparency of water in the PCP-treated corrals (Figure 6). Mean concentration of oxygen in the water at a depth of m showed a decline in the PCP-treated corrals immediately posttreatment (Figure 6), but again the variability among the replicate enclosures was extremely high, especially for the control corrals so this difference was not statistically significant (P>). At the lower depth of m, there seemed to be little difference in oxygen concentration and the tremendous %ariability associated with the mean values was attributed to the presence of a hypolimnion in two of the enclosures (Figure 6). Chlorophyll a concentration was also highly variable within replicate enclosures during the pretreatment period (Figure 6). Although there was less variation during the posttreatment period, there was no discernable impact of PCP on mean chlorophyll levels. The chemical parameters of the water also appeared to be, for the most part, unaffected by the addition of PCP (Table 7), with some notable Tike ccwrsj exceptions. The concentration of chlorine ions was significantly higher for the entire posttreatment iT'^^^^^^^^^ •^ •> ° f beccni readings and concentration of chlorophyll a in control and PCP-treated period in the corrals treated with PCP. Carbon corraU for Experiment l, ^J. application of pcp (POC) and nitrogen (PN) of particulate matter decreased immediately after PCP was applied but this decrease was short lived with recovery to levels similar to those in the controls by d if Oxygo
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