样品使用前，需平衡至室温。开封后，应尽快恢复密封状态，在规定条件下保存。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。 The sample should be balanced to room temperature before use. After opening, the seal should be restored as soon as possible and stored under the specified conditions. This reference material is a kind of toxic and harmful substance. When using it, pay attention to protection and avoid inhalation or contact with skin.