The hydrolysis and photolysis of zinc pyrithione（ZPT），an additive for marine antifouling coatings，under different environmental conditions were studied to evaluate its possible risks in fresh water and marine environments. According to the standard of hydrolysis and photolysis methods of ASTM for organic pollutants，the residual ZPT concentrations in hydrolysis and photolysis solutions under different conditions and their growth inhibition toxicities against Dunaliella salina were tested. The results showed that alkaline pH（9. 0） value was beneficial to both hydrolysis and photolysis of ZPT，while brine（ASW）was not conducive to the hydrolysis of ZPT，but was conducive to its photolysis. The toxicities of degradation solutions in fresh water environments was mainly contributed by residual ZPT，while the toxicities of degradation solutions in sea water environments was significantly higher than those of residual ZPT. Therefore，as an additive in marine antifouling coatings，the toxicity risk of ZPT to the marine environment needs further consideration.
DIAO Yang
,
PIAN Shuang-Shuang
,
DING Cheng-Cheng
,
JIAN Cheng
,
JIN Cui-Li
,
ZHOU Xiao-Xian
. Preliminary Study on Hydrolysis and Photolysis of Antifouling Additive Zinc Pyrithione and the Toxicity of Its Degradation Products[J]. Paint & Coatings Industry, 2019
, 49(11)
: 1
-6
.
DOI: 10.12020/j.issn.0253-4312.2019.11.1
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