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to 176 mL of 0.23 wt% sodium citrate and stirred at 80 ¡ãC for 20 min¡£

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wt% ÊÇÖ¸ weight percent£¬ÔÚÒ»°ãÎÄÏ×ÀïÒ²¿ÉÒÔд×÷ w/w.
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