使用前，在P2O5干燥器中干燥48小时以上，以除去水分。本标准物质属于有毒有害物质，使用时应注意防护，避免吸入或与皮肤接触。样品开封后，应尽快恢复密封状态，在规定条件下保存。 Before use, dry it in a P2O5 dryer for more than 48 hours to remove moisture. This standard substance is a toxic and hazardous substance, and it should be protected when using it to avoid inhalation or contact with the skin. After the sample is opened, the sealed state should be restored as soon as possible and stored under the specified conditions.