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03240331

银虫 (小有名气)

[求助] 求高手帮我翻译这句话一下

Mobile phase: mix 230 volumes of methanol R and 5 volumes of glacial acetic acid R with 770 volumes of a 2.70g/l solution of sodium dihydrogen phosphate R containing 3.50g/l of sodium octanesulphonate R and previously adjusted to PH 2.5 with phosphoric acid R.
请高手帮忙翻译下,主要是最后一句中用磷酸调剂PH到2.5 是调哪个溶液?
谢谢!
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chemgirl

捐助贵宾 (著名写手)

深海凝眸

【答案】应助回帖

03240331(金币+2): 谢谢 2011-05-05 15:34:55
肯定是最后配完溶液之后再调pH值了, previously 是相对于"使用时"说的.
调pH值就像配溶液一样,不管之前加了什么,加多少种东西,都是最后才定容.
汪洋之中谁来守护你寂寞的帆,晴空之下谁来垂怜你眼里无声呐喊
7楼2011-05-05 15:11:15
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891002syl

木虫 (小有名气)

【答案】应助回帖

03240331(金币+2): 谢谢 2011-05-05 15:34:13
流动相:用770升2.70g/L的磷酸二氢钠溶液混合230升甲醇和5升冰醋酸,其中磷酸二氢钠溶液中还包含用磷酸初步调剂PH到2.5的3.50g/L辛烷磺酸钠溶液。
2楼2011-05-05 14:57:52
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wssahnh

铜虫 (小有名气)

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03240331(金币+2): 谢谢 2011-05-05 15:34:24
本人理解:previously adjusted to PH是说在混合前调pH,就溶液的酸碱性来说,应该是调230V的甲醇和5V的冰醋酸的预混合溶液,因为其是酸性的;  后面与调好pH的溶液混合的是770V 含 2.70g/l 的磷酸二氢钠和 3.50g/l 正辛烷磺酸钠的溶液~~~(以上仅供参考)~~~
从此与小木虫为伴!
3楼2011-05-05 14:59:34
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love_wm

金虫 (正式写手)

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03240331(金币+2): 谢谢 2011-05-05 15:34:36
Mobile phase: mix 230 volumes of methanol R and 5 volumes of glacial acetic acid R with 770 volumes of a 2.70g/l solution of sodium dihydrogen phosphate R containing 3.50g/l of sodium octanesulphonate R and previously adjusted to PH 2.5 with phosphoric acid R.
流动相: 混合有230体积的methanol R,5体积的glacial acetic acid R和770体积的包含有2.7g的磷酸二氢钠、3.5g 的sodium octanesulphonate R ,以上这些物质所形成的溶液用phosphoric acid R将溶液调节为pH值到2.5。应该是磷酸去调节,不过不明白你这R是WHAT意思?
猝然临之而不惊,无故加之而不恼
4楼2011-05-05 15:01:57
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