Toxicity of Naphthenic Acids on the Chlorophyll Fluorescence Parameters and Antioxidant Enzyme Activity of <i>Heterosigma akashiwo</i>.

In addition, the SOD activities of the experimental group treated with 16 mg/L NAs were 52.22% of the control group, and the difference was highly significant ( p < 0.01).

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With an increase in time, in the 72 and 96 h phase, the SOD activity of the low-concentration NAs treatment group (2 mg/L) was 160.28% and 137.50% of that of the control group, and there was an extremely significant difference ( p < 0.01).

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A decreasing trend in the SOD activity was observed when the NA concentration was greater than 4 mg/L, and this change was similar to the CAT activity.

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Effects on the ChlF (Chlorophyll Fluorescence) Parameters As shown in Figure 3 A for the ETR, when the NAs’ concentration was in the range of 0–2 mg/L and 4–16 mg/L at 96 h, the ETR of each group was compared, and there was an increasing trend.

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