N***r
发帖数: 2539 | 1 //////////////////////////////
Sorry I don't have Chinese input here.
I am lack of knowledge of Chemistry....
This question was raised when I read a journal paper, A model of chemistry
and thermal hydraulics in PWR fuel crud deposits, Journal of Nuclear
Materials 353 (2006) 1–11
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As a background, in PWR (pressurized water reactor), certain chemistry species are added into the coolant system to control reactivity, pH value, etc. Two common these species are H3BO3 and... 阅读全帖 |
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N***r
发帖数: 2539 | 2 can someone give a hint?
baozi appreciate
species are added into the coolant system to control reactivity, pH value,
etc. Two common these species are H3BO3 and LiOH, the concentrations of
which have orders of magnitude of 1000ppm and 1ppm, respectively.
and LiOH) forms on the fuel caldding surface and these species accumulate in
this crud layer so that the concentrations become high. This high
concentration depends on how deep it penetrates into the porous crud layer
concentrations become real... 阅读全帖 |
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s****s
发帖数: 66 | 3 个人猜测啊，不是我的方向呵呵。
就像灰尘飘空中一样，用concentration表示应该没问题吧？
这个沉淀是不是没有聚集起来，只是形成类似浊液的表面层啊？
当然肯定会有一些理由来解释为什么这层浊液能吸附上去啦，就像你说了的那些离子的
存在。
species are added into the coolant system to control reactivity, pH value,
etc. Two common these species are H3BO3 and LiOH, the concentrations of
which have orders of magnitude of 1000ppm and 1ppm, respectively.
and LiOH) forms on the fuel caldding surface and these species accumulate in
this crud layer so that the concentrations become high. This high
concentration depends... 阅读全帖 |
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x*******6
发帖数: 994 | 4 Sorry, I can't input Chinese right now.
I did acid treatment of carbon in orde to get -COOH. Is that possible to
bond -COOH to H3BO3? Or -COO (-) to H3BO3?
Thanks |
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o******n
发帖数: 511 | 6 【 以下文字转载自 Chemistry 讨论区 】
发信人: ostrakon (ostrakon), 信区: Chemistry
标 题: 求助：这几样放一起为啥不溶？
发信站: BBS 未名空间站 (Thu Apr 1 17:50:04 2010, 美东)
有个培养基，要求这些东西：
(1) The trace elements (10 mg H3BO3, 11.19 mg MnSO4 · H2O, 124.6 mg ZnSO4
· 7H2O, 78.22 mg CuSO4 · 5H2O, and 10 mg MoO3) are dissolved in 100 ml
sterile distilled water and then stored in the refrigerator for up to
several months;
前几样都能溶，加了Mo后，一直有白色粉末（沉淀？）在烧杯底部，加温，延长时间都
不行。
(2) FeSO4 · 7H2O (100 mg) is dissolved in 10 ml sterile distilled water and
is |
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o******n
发帖数: 511 | 8 有个培养基，要求这些东西：
(1) The trace elements (10 mg H3BO3, 11.19 mg MnSO4 · H2O, 124.6 mg ZnSO4
· 7H2O, 78.22 mg CuSO4 · 5H2O, and 10 mg MoO3) are dissolved in 100 ml
sterile distilled water and then stored in the refrigerator for up to
several months;
前几样都能溶，加了Mo后，一直有白色粉末（沉淀？）在烧杯底部，加温，延长时间都
不行。
(2) FeSO4 · 7H2O (100 mg) is dissolved in 10 ml sterile distilled water and
is stored in the refrigerator for up to several months;
这个还好
(3) All of the other ingredients including 4.0 g KH2PO4, 6.0 g Na2HPO4, 0. |
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x*******6
发帖数: 994 | 9 H3BO3和CH3OH反应生成trimethyl borate， 如果不加入浓硫酸，trimethyl borate是
否产率很低？ 一般没有浓硫酸可生成多少trimethyl borate？trimethyl borate可否
和-COOH基反应？ 本人非化学专业，多谢。 |
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x*******6
发帖数: 994 | 12 请问，炭黑能溶于己烷(Hexane)？炭黑有炭。我不是很懂，问错了别介意。 |
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y*****s
发帖数: 1047 | 15 炭黑当然有氢，只不过少而已
炭黑不溶是因为要打开共价键才能溶，就算打开了也就不是炭黑了。。。 |
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g*****n
发帖数: 2588 | 18 用溶解度来说的话，硼酸在己烷中的溶解度可能跟水在己烷中的溶解度一个数量级。 |
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c**********n
发帖数: 1982 | 20 是不是问错版面了？
简单查了一下，boric acid主要溶于水和醇类的极性溶剂，估计在hexane里溶解度很低吧 |
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m****e
发帖数: 161 | 23 【 以下文字转载自 Singapore 讨论区,原文如下 】
发信人: mymike (反应器), 信区: Singapore
标 题: Re: [转载] help!!!!!!!(Chemistry)
发信站: The unknown SPACE (Fri Apr 21 08:27:46 2000) WWW-POST
我们也这样认为
可是在与其他无机盐溶液混合则无此现象
当溶液中有其他组分:
K2HPO4
KH2PO4
NaNO3
(NH4)2SO4
MuSO4.H2O
CoCl2.6H2O
CaCl2
ZnSO4.7H2O
CuSO4.5H2O
H3BO3
Na2MoO4.2H2O
AlK(SO4).12H2O |
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