| 查看: 464 | 回复: 2 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
qhd511铁杆木虫 (著名写手)
|
[求助]
请帮忙润色一段化学试验操作，谢谢！
|
||
| 50 mL wastewater sample was accurately pipetted into a 100 mL beaker. Air-dried sludge sample was grinded a representative portion until it passed entirely through the 0.20 mm sieve to give a sub-sample of approximately 20 g. Approximately 1.0000 g sludge sample was accurately weighed into a 100 mL beaker, then added 2 mL N and 7 mL C to the wastewater and sludge samples as described above. and Thereafter, gently shaken to mix the contents, heating on an electric hot plate until they gave a lot of white smoke of N. The solutions obtained were cooled to room temperature, and 5 mL 50% (v/v) H was added. Heated again on the electric hot plate until they were evaporated to almost dryness. After cooling, the solutions in the breakers were transferred into 50 mL colorimetric tube times with a small amount of deionized water to 50 mL. Diluting the digestion solution properly, then added H and T acid following the calibration curve program. The final solution volume was kept at 50mL. |
回复此楼» 收录本帖的淘帖专辑推荐
 精品翻译集锦 |
» 猜你喜欢
0805 316求调剂
已经有6人回复
-
085601求调剂总分293英一数二
已经有3人回复
-
考研调剂
已经有3人回复
-
08工学调剂
已经有17人回复
-
340求调剂
已经有4人回复
-
311求调剂
已经有3人回复
-
食品专硕 一志愿双一流 328
已经有4人回复
-
材料调剂
已经有6人回复
-
300分，材料，求调剂，英一数二
已经有5人回复
-
求调剂，一志愿:南京航空航天大学大学 ，080500材料科学与工程学硕，总分289分
已经有5人回复
qhd511
铁杆木虫 (著名写手)
- 翻译EPI: 1
- 应助: 324 (大学生)
- 金币: 6915.3
- 散金: 226
- 红花: 12
- 帖子: 1922
- 在线: 390.1小时
- 虫号: 1079710
- 注册: 2010-08-22
- 性别: GG
- 专业: 环境分析化学
3楼2012-05-08 12:13:03
8814402
至尊木虫 (职业作家)
- 翻译EPI: 509
- 应助: 18 (小学生)
- 贵宾: 0.381
- 金币: 12916.1
- 散金: 47
- 红花: 16
- 帖子: 4183
- 在线: 357.8小时
- 虫号: 1184404
- 注册: 2011-01-06
- 专业: 药物学其他科学问题
2楼2012-05-08 11:33:50
20