Study on toxicity by half-effect concentrations of trace ele-ments in eelgrass:aboveground elongation length and maxi-mum light quantum yield as indexes
Eelgrass has a complete structure consisting of roots,stems,and leaves and completes its entire life cycle in seawater.In this study,the toxic effects of sodium arsenite(NaAsO2),sodium chromate tetrahydrate(Na2CrO4·4H2O),mercury chloride(HgCl2),nano-silver(AgNPs),nickel sulfate hexahydrate(NiSO4·6H2O),and zinc sulfate heptahy-drate(ZnSO4·7H2O)on eelgrass were studied through laboratory simulation experiments.The different concentrations used for inducing stress were NaAsO2(0,1,2,4,and 8 mg/L),Na2CrO4·4H2O(0,20,40,80,and 120 mg/L),HgCl2(0,0.4,0.5,0.6,and 0.7 mg/L),AgNPs(0,1,4,7,and 10 mg/L),NiSO4·6H2O(0,1×103,3×103,5×103,and 10×103 mg/L),and ZnSO4·7H2O(0,0.01×103,0.05×103,0.1×103,0.5×103 mg/L).The partial elongation length and maximum light quantum yield(Fv/Fm)were inhibited by all six elements.The half-effect concentrations of NaAsO2,Na2CrO4·4H2O,HgCl2,AgNPs,NiSO4·6H2O,and ZnSO4·7H2O were 2.1 mg/L(As:16.0 μmol/L)and 89.8 mg/L(Cr:384.6 μmol/L),0.65 mg/L(Hg:2.2 μmol/L),8.1 mg/Ml(Ag:75.0 μmol/L),3.0×103 mg/L(Ni:1.1×104 μmol/L),7.5×104 mg/L(Zn:2.6×105 μmol/L).The toxicity was in the order of Hg>As>AgNPs>Cr>Ni>Zn.
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