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zhl198320

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snipher950

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Different types of polyurethane synthetic rubber sports track materials were digested with HNO3-HClO4. The flame atomic absorption spectrophotometry was used to test the heavy metal contents. The results showed that the content of lead, zinc, chromium and cadmium were very high. The rates of standard recovery of lead, zinc, chromium and cadmium were 99.37%, 99.52%, 92.97%, and 92.39% respectively. RSD values were 6.497%, 4.186%, 7.910£¥and 12.65£¥respectively.
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