The sample was diluted by water containing a little amount of sodium chloride, and then extracted by hexane, purified by oil of vitriol to decrease impurity. The extracted solution was analyzed by GC-ECD and quantified by external standard method.

試樣加水稀釋最近中文字幕视频2019下载，加入少量氯化鈉，再用正己烷提取一级特黄生活视频一区二区，濃硫酸凈化樣品美女被干到高潮免费视频，排除干擾雜質(zhì)，以GC-ECD測(cè)定操一操日一日干一干，外標(biāo)法定量女十八岁免费很黄很黄黄片，六六六和滴滴涕在0.005~0.2μgmL^(-1)范圍內(nèi)，質(zhì)量濃度與峰面積呈良好的線性關(guān)系成人午夜在线观看影院免费播放视频。

Used thin-layer chromatography, outspread dose were CHC13: MeOH (8.5: 1.5) and CHC13: MeOH (7:1)(with a little ammonia and diethylamine), color reagent was 10% oil of vitriol. Observe the fluorescent spots and color sports.

通過(guò)薄層層析色譜的分析直接播放的毛片网站，分別用黃酮展開(kāi)劑CHCl_3∶MeOH(8.5∶1.5)和生物堿展開(kāi)劑CHCl_3∶MeOH(7∶1)薄層展開(kāi)后，10％的濃硫酸顯色91国内自拍第九页，觀察熒光和顯色斑點(diǎn)一级A片免费91。

The first sulfuric acid in the world was prepared by destructive distillation of green vitriol［ferrous sulfate FeSO4.7H2O］in the second half of 15th century.

世界上最早的硫酸，產(chǎn)生于15世紀(jì)后半葉先锋影音av资源专区，當(dāng)時(shí)的原料為綠礬石［FeSO4.7H2O］饥渴40岁熟妇口爆，通過(guò)對(duì)其加熱分解和吸收制出硫酸。

In conclusion, the sample which produced by the first modification method of treatment was in pH value of 4-10, chromium ion density of 10mg/L-100mg/L, absorb temperature of 20 degree Centigrade - 35 degree Centigrade, the surplus of green vitriol is 50% 's operation conditions according to chemistry measure, and the chromium ion has high and steady 's rate of wipe off, all can be more than 99%.

研究表明在线免费激情视频，改性灰Ⅰ在pH值4～10，六價(jià)鉻離子濃度10mg/L～100mg/L国产91久久久久久，吸附溫度20℃～35℃黄片一区二区免费看，按化學(xué)計(jì)量比硫酸亞鐵余量50％的操作條件下，鉻離子有較高且穩(wěn)定的去除率av免费看不卡，達(dá)到99％以上免费在线黄色视频官网。