The operating parameters to determine the isotope abundance ratio for 〓Pu/〓Pu by ICP-MS were optimized for the first time in China.

采用優(yōu)化的儀器條件，測(cè)定了〓Pu／〓Pu的比值。將同位素稀釋法應(yīng)用于ICP-MS，測(cè)量了環(huán)境樣品中Pu的含量。

Lead ; atmospheric aerosols ; isotope abundance ratio

鉛国产高清自拍高清； 大氣顆粒物；同位素豐度比

Nature, most elements have two or more isotopes, the same kinds of elements in the quality of the various isotopes of different, but the types and proportion constant (except for radioactive elements). In 1961, the carbon content of the most abundant in nature, a kind of isotope, carbon-12 atom of a quantity and quality of C as a 12 mass units to it as "benchmarks" for all isotopes of an element according to the average abundance The ratio of the benchmark is the atomic weight of this non-prime, that is listed in the periodic table of atomic weights.

自然界中大多數(shù)元素都有兩種或更多的同位素99热这里精品5，同種元素的各同位素質(zhì)量不同日韩精品理论片在线观看，但其種類和比例是恒定的免费亚洲爱爱视频。1961年，把碳在自然界含量最豐富的一種同位素欧美黑人大屌视频，碳12的一個(gè)原子的質(zhì)C量定為12個(gè)質(zhì)量單位韩国日本国产欧美一区二区，把它作為"基準(zhǔn)"，某種元素的所有同位素按豐度的平均值與基準(zhǔn)之比中日韩一级小片免费播放，就是這種無素的原子量啪啪啪啪网址，即元素周期表列出的原子量。

The differential eguations and boundary conditions are established, based on these hypotheses. The theoretical formulary about sample atom number with different diffusion coefficient are reasoned out; the relationship between the isotope abundance ratio and the sample wastage of melting and solid samples and the samples simultaneously at evaporation and decomposition are discussed in theory.

根據(jù)這三條假設(shè)建立了樣品原子數(shù)的微分方程及邊界條件国产特黄特色AA片一级真人视频，推導(dǎo)出了不同擴(kuò)散系數(shù)的樣品原子數(shù)的理論公式欧美AA级三级片，從理論上討論了熔融態(tài)、固態(tài)樣品以及蒸發(fā)分解同時(shí)發(fā)生的樣品同位素豐度比與樣品消耗量間的關(guān)系99热这里只有在线观看精品9。

Uranium isotope abundance ratio has been measured by total sample evaporation and signal integration, and a thermal surface ionization mass sepctrometry equipped with multicollector has been used.

采用全蒸發(fā)技術(shù)成人福利影院免费观看网站、離子流強(qiáng)度積分的方式，用多接收器熱表面電離質(zhì)譜計(jì)測(cè)量鈾同位素豐度国产精品视频一区二区三区...。

The direct incorporation of U-13C glucose was estimated by the intensity increase of m/z to F(F was parent fragment, and n was the carbon number in the fragment), while the total isotope incorporation from the added 13C could be calculated according to the abundance ratio increment summation from m/z (Fa+1) through (Fa was the fragment containing all original skeleton carbons, and T was the carbon number in the amino acid molecule). The 13C enrichment in the target compound was expressed as atom percentage excess, and that of D-amino acid needed to be corrected by the coefficient of hydrolysis-induced racemization. The 13C enrichment reflected the carbon turnover velocity of individual amino acid enantiomers, and was powerful to investigate the dynamics of soil amino acids.

外加葡萄糖直接合成氨基酸的比例可利用質(zhì)譜碎片的相對(duì)強(qiáng)度變化來評(píng)價(jià)（n為質(zhì)譜碎片F(xiàn)中含有的碳原子數(shù)目）国产精品久久永二区二区；而源于葡萄糖的13C同位素在氨基酸分子中的富集程度是所有同位素峰相對(duì)強(qiáng)度變化的總和。13C在目標(biāo)化合物中的富集比例用原子百分超評(píng)價(jià)欧美一级片免费网，D氨－基酸的APE還需進(jìn)一步利用水解誘導(dǎo)的外消旋化系數(shù)校正黄色性交网站性。13C在目標(biāo)化合物中的富集程度可反映各氨基酸手性異構(gòu)體的碳循環(huán)速率大小，是研究土壤氨基酸動(dòng)態(tài)變化的有力工具国产污视频在线免费看。

32P isotope tracing technique was used in this study,and the results indicated that phosphorus stored or pre-existed in roots would be remobilized in maize under phosphorus deficiency from root cortical cells with lysis to shoot mostly rather than root apex during aerenchyma formation.

Kraus等的試驗(yàn)表明玉米根系從土壤中吸收的32P可在根皮層內(nèi)保留15 d香蕉视频95，之后逐漸減少[2]。這意味著與葉片的情形相似尤物黄色录像视频大全观看视频，根內(nèi)也進(jìn)行著磷的活化和再運(yùn)轉(zhuǎn)大色妞基地在线视频观看。當(dāng)植物處于磷脅迫下時(shí)，根系吸收的磷素遠(yuǎn)不能滿足植物各器官生長發(fā)

The K-Ar isotope age of albite phenocryst in albitophyre vein is 372Ma,while that of the ground mas.

鈉長斑巖中鈉長石的K－Ar年齡為372Ma天堂网视频在线播放，基質(zhì)年齡為337Ma丁香五月激情综合在线。

Pb isotope values of Chukchi Sea and the Bering Sea are within the scope of northern Pacific"s, and closing to lead isotope average of Lena River"s in eastern Siberia flowing into the Laptev Sea,and north Pacific especially impact on the Bering Sea.(6)Lower ?

楚科奇海和白令海鉛同位素值在太平洋北部鉛同位素值變化范圍之內(nèi)，并且與流入北極拉普捷夫海的西伯利亞東部勒拿河鉛同位素平均值接近国产91精品片在线，太平洋北部尤以對(duì)白令海的影響更為明顯。

Pb isotope values of Chukchi Sea and the Bering Sea are within the scope of northern Pacific\'s, and closing to lead isotope average of Lena River\'s in eastern Siberia flowing into the Laptev Sea,and north Pacific especially impact on the Bering Sea.(6)Lower ?

楚科奇海和白令海鉛同位素值在太平洋北部鉛同位素值變化范圍之內(nèi)神马播播岛热岛私人影院，并且與流進(jìn)北極拉普捷夫海的西伯利亞東部勒拿河鉛同位素均勻值接近欧美4438，太平洋北部尤以對(duì)白令海的影響更為明顯。