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phitong

木虫 (小有名气)

[求助] 土壤碳库测定

现在小虫做实验,欲采用Rovira and Vallejo(2002)的方法来分析土壤活性和惰性有机碳库。
Rovira and Vallejo(2002)文章简述如下:Briefly, 20 mL of
5NH2SO4 was added to 500 mg soil, and the sample was hydro-
lyzed for 30 min at 105 C in sealed Pyrex tubes, after which
the hydrolysate was recovered by centrifugation and decantation.
The residue was washed with 20 mL of de-ionized water and the
washing added to the hydrolysate. This hydrolysate was taken as
labile pool I (LPI) and analyzed for labile pool I carbon (LPI-C) and
nitrogen (LPI-N). The remaining residue was hydrolyzed with 2 mL
of 26 N H2SO4 overnight at room temperature under continuous
shaking. The concentration of the acid was then brought down to
2 N by dilution with de-ionized water and the sample was hydro-
lyzed for 3 h at 105 Cwith occasional shaking. The hydrolysatewas
recovered in the same manner as for the LPI. This second hydro-
lysatewas taken as labile pool II (LPII) and analyzed for labile pool II
carbon (LPII – C) and nitrogen (LPII – N).
问题如下:1.离心速度多大合适?
                  2.称量土,加入2.5 M H2SO4溶液这一步可以直接放在离心管中高温水解吗?不可以的话,该用什么容器,之后如何无损失转移?
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zhangling7616

木虫 (正式写手)

引用回帖:
7楼: Originally posted by phitong at 2012-01-06 08:46:38:
是的,请问你做过这个方面的吗?

看一下土壤农化分析,好像是用的硫酸-重铬酸钾外加热法,比这个容易一点,史瑞和主编的吧,或者鲁如坤主编。
天空没有留下鸟的痕迹,但是鸟已经飞过。
8楼2012-01-06 09:32:32
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phitong

木虫 (小有名气)

肿么没有人关注啊?小虫很急啊···
2楼2012-01-05 09:17:52
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kingslcq

新虫 (正式写手)

爱科学的PH.D & Prof.

感谢参与,应助指数 +1
zongyu_1986(应助指数-1): 无效应助,扣除应助指数 2012-01-06 12:29:15
3楼2012-01-05 19:50:01
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kingslcq

新虫 (正式写手)

爱科学的PH.D & Prof.

4楼2012-01-05 19:50:17
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