STUDY ON RESIDUES OF ~(14)C-CARBOFURAN IN MODEL RICE-FISH ECOSYSTEM

Residues of 14C- carbofuran were studied in model late- rice ecosystem (LRE) and early- rice ecosystem (ERE). The treatment consisted of two rates of the pesticide (1x) and 2.5x). At day 56 after application, 7.3% (1x) and 2.9% (2.5x) of the pesticide and its degradative products remained in the water of the LRE, and 1.8% (1x) and 2.4% (2.5x) of them remained in the water of the ERE. At harvest, 37.5% (LRE) and 24.0% (ERE) of the pesticide applied were detected in the upper layer of the soil; and 40.6% (LRE) and 26.9% (ERE) remained in the lower layer of the soil. The residues in the rice plants increased at the first stage, reached maximum levels during day 14 to 28 after application, and decreased thereafter. At harvest, residues in the stems and leaves in the two treatments (1x and 2.5x) were 3.91μ g/g and 7.78μ g/g (LRE) and 5.04 μg/g and 17.29 μ g/g (ERE) respectively. Residues in the ears were about 1/8 to 1/12 of that in the other parts of the plants. The pesticide residues in fish bodies in both experiments were also determined.     

STUDY ON BEHAVIOUR OF CR FORMULATION OF THIOBENCARB IN A MODEL PADDY FIELD

The fate of CR formulation of ^14C-thiobencarb (thio.)was studied at the high rate of application in a model paddy field.Thio.could be released from the alginate formulation (TAL-17189) into water.The concentration of thio.in water increased with time,then declined.Thio.in water could be converted to more than 12^14C-degradation products which changed with time.An unknown degradation product(Mo) was always prevailing after application.Thio.in water could be adsorbed by soil particles.Most of the adsorbed thio.retained in upper layer.Thio.in soil could be also degraded to more than 6 products.Thio.and its degradation products could conjugate with the compositions of soil to bound residues(BR),Thio.was 45.6% of the total 14C-extractable residues(ER) in upper layer soil at harvest,14C-thio.in water and soil could be uptaken by rice plants.Thio.In plants existed in ER and BR.Most of ^14C-residues in straw,roots,brown rice and husk were in bound form,more than 92% of the total ^14C in them at harvest respectively,Thio.in plants could be metabolzed to more than 9 metabolites which changed with time.^14C-thio.in straw brown rice and husk accounted for 55.88,6.06 and 11.18% of the total ^14C-ER of them at harvest respectively.An unknown ^14C-metabolite in brown rice was prevailing accounted for 63.03% of the total ^14C-ER.     

THE FATE OF ~(14)C-FENITROTHION IN RICE-FISH MODEL ECOSYSTEM

The fate of fenitrothion in rice- fish ecosystem was studied using C- fenitrothion (14C- F) labelled at methoxyl and two application rates. The fenitrothion in water disappeared quickly, only 8 and 11 ppb in two treatments at harvest were detected respectively. Most of 14C-F in soil existed in upper layer and that in plants appeared in shoots. The extractable residues in cargo rice were 0.36 and 0.58 ppm in two treatments respectively. 14C- residues (14C- R) were concentrated in bones, next viscera, meat and scales. Total 14C-R in meat were 0.92 and 1.77 ppm at harvest. Comparing two treatments, the residue dynamics of fenitrothion in water, soil, plants and fish were similar. 14C- R in water and soil after harvest affected the rice- fish ecosystem in the next season. However, the extractable 14C- R in cargo rice, soil and water were very low. Fenitrothion 14C- fenitrothion Rice- fish Model ecosystem     

STUDY ON BEHAVIOUR OF CR FORMULATION OF THIOBENCANB IN A MODEL PADDY FIE

ＳＴＵＤＹＯＮＢＥＨＡＶＩＯＵＲＯＦＣＲＦＯＲＭＵＬＡＴＩＯＮＯＦＴＨＩＯＢＥＮＣＡＮＢＩＮＡＭＯＤＥＬＰＡＤＤＹＦＩＥＬＤＳｕｎＪｉｎｈｅ（孙锦荷）；ＬｉＸｉｎｇｍｉｎｇ（李兴明）；ＣｈｅｎＺｉｙｕａｎ（陈子元）ａｎｄＺｈａｎｇＱｉｎｚｈｅｎｇ（张...     

STUDY ON OCCURENCE FORM OF PLATINUM IN XINJIE Cu－Pt DEPOSIT BY NAA AND SCANNING PROTON MICROPROBE

ＳＴＵＤＹＯＮＯＣＣＵＲＥＮＣＥＦＯＲＭＯＦＰＬＡＴＩＮＵＭＩＮＸＩＮＪＩＥＣｕ－ＰｔＤＥＰＯＳＩＴＢＹＮＡＡＡＮＤＳＣＡＮＮＩＮＧＰＲＯＴＯＮＭＩＣＲＯＰＲＯＢＥＬｉＸｉａｏｌｉｎ，ＺｈｕＪｉｅｑｉｎｇ，ＧｕＹｉｎｇｍｅｉ，ｗｕＸｉａｎＫａｎｇ（Ｓ...     

STUDY ON THE DISTRIBUTION OF SELENIUM AND OTHER ELEMENTS IN CORN SAMPLES BY NAA AND BIOCHEMICAL TECHNIQUE

Biochemical technique was used to separate three kinds of proteins (albumin, globulin and gliadin) in corn samples froin high selenium areas and normal areas in Erxi autonomous region of Hubei Province, China. The contents of Se and other elements in these proteins were determined by neutron activation analysis (NAA). The results show that Se is enriched in corn proteins at high selenium area, while Cu, Al, Mn, V and Cl are also enriched in varying degrees.     

AN INAA STUDY ON SOIL BACKGROUND VALUES OF U,Th AND REE IN CHINA

The background values of elements in soil have been investigated by INAA. The contents of 8 REE (La, Ce, Nd, Sm, Eu, Tb, Yb and Lu), U and Th in 364 top soil samples (A horizon) in China were determined by INAA. The samples were collected from some typical areas in China and covered main soil types of these areas. The background values of above elements in soil of the different areas and the whole soil studied in China are reported in present paper. The distribution characteristics of REE, U and Th in soils are also discussed.     

N－甲基－~（14）C苄基胺及其亚硝胺的合成

报道了Ｎ－甲基－１４Ｃ苄基胺和Ｎ－甲基－１４Ｃ苄基亚硝胺的合成，比活度约为９．２×１０１１Ｂｑ／ｍｏｌ。由高压液相色谱仪测得的化学纯度和放化纯度均大于９５％。     

STUDIES ON RADIATION INDUCED CROSSLINKING OF CIS 1，4－POLYBUTADIENE BY ~（13）C NMR

ＳＴＵＤＩＥＳ　ＯＮ　ＲＡＤＩＡＴＩＯＮ　ＩＮＤＵＣＥＤ　ＣＲＯＳＳＬＩＮＫＩＮＧ　ＯＦ　ＣＩＳ　１，４－ＰＯＬＹＢＵＴＡＤＩＥＮＥ　ＢＹ　~（１３）Ｃ　ＮＭＲＺｈａｏＸｉｎ；ＤｕＹｏｕｒｕａｎｄＹｅＣｈａｎｈｕｉ（ＬａｂｏｒａｔｏｒｙｏｆＭａｇｎｅ?..     

~（14）C－呋喃丹在模拟鱼－萍水生生态系统中的分配

研究了１４Ｃ标记的呋喃丹在模拟鱼－萍水生生态系统中的分配、消失和残留。结果表明，水中呋喃丹被底泥吸附，鱼体摄取和消解随时间延长而逐渐减少。鱼体对味哺丹具有一定的富集，而且残留浓度较高，体内各部位的残留浓度差异又较大，其顺序为：内脏＞骨＞肉＞鳃＞皮。     

THE STUDY OF NEUTRON EMISSIONS IN 585 MeV PROTONS ON ~(56)Fe WITH QMD

The analyses of intermediate energy nucleon-nucleus collisions are com-monly based on the frame work of intranuclear cascade model.This model treats the reaction machanism in terms of a succession of nucleon-nucleon col-lisions with particles emitted at the various stages as the projectile energy is progressively dissipated in the target nuclei.     

STUDY ON OCCURENCE FORM OF PLATINUM IN XINJIE Cu—Pt DEPOSIT BY NAA AND SCANNING PROTON MICROPROBE

A combination of NAA and micro-PIXE was used to study concentrations and distributions of platinum group elements (PGE) in ores from Xinjie Cu-Pt deposit.The NAA results of the bulk indicate that the ores belong to the enriched Pt-Pd type.The element concentration maps of scanning micro-PIXE for the ores show that the occurence form of Pt is independent arsenide minerals.No PGE were detected in chalcopyrite of Xinjie Cu-Pt deposit.These information are economically beneficial to the mineral smelting process.     

RELEASE OF ~(14)C—BUTACHLOR AND ~(14)C—OXADIAZON FROM CR FORMULATIONS INTO WATER

~(14)C-butachlor and ~(14)C-oxadiazon could be released from four kinds of CR formulations into water respectively, and the release percentage of each herbicide increased with time, which could be expressed by regression equations (very obvious positive relationship). The release percentages of ~(14)C-herbicides from CR formulations were related to herbicide CR formulation and water type. Total recovery including ~(14)C-released and ~(14)C-left in formulations for each ~(14)C-herbicide was high at the 56th day after treatment. Some of the released ~(14)C-butachlor in water could be hydrolysed although under dark condition. The rate of hydrolysis was influenced by water type and formulations.     

反应堆退役废物中~3H，~（14）C，~（36）Cl，~（63）Ni和~（55）

用液闪计数法测定了国内某退役反应堆堆芯石墨中的~３Ｈ、~（１４）Ｃ、~（３６）Ｃ，及不锈钢、碳钢锈垢和水池底泥中~３Ｈ、~（６３）Ｎｉ、~（５５）Ｆｅ，并对上述固体介质样品的制样与测量问题进行了讨论。     

~（14）C—p，p′－DDE在亚热带土壤中的行为

用１４Ｃ－标记的化合物研究了ｐ,ｐ＇－ＤＤＥ在我国亚热带地区杭州黄松土旱地和淹水的土壤中的行为。Ｐ,Ｐ＇－ＤＤＥ在旱地土壤中的消失速度要比淹水土壤中快。在淹水土壤中,它的总残留半减期为４３天,而在旱地土壤中仅为２５天．在两种条件下Ｐ,Ｐ＇－ＤＤＥ在分布模式上无明显差异．１４Ｃ－ｐ,ｐ＇－ＤＤＥ残留的大部分集中在土壤剖面的２ｃｍ以内。无论在旱地中还是在水田中,１４Ｃ－ｐ,ｐ＇－ＤＤＥ都是很稳定的,它的残留提取物中大部分（９０％以上）仍然是ｐ,ｐ＇－ＤＤＥ。     

CALCULATION AND ANALYSIS OF PROTON INDUCED REACTIONS ON ~(63)Cu IN ENERGY REGION 3～55 MeV

A set of proton optical potential parameters for E≤55 MeV is obtainedon the available experimental data of ~(63)Cu and neighbour nucleus ~(62)Niand ~(64)Zn,and all cross sections of proton induced reactions on ~(63)Cu are calcu-lated.The calculated results are compared with experimental data.     

18．8－46．2MeV／u~（12）C与~（93）Nb相互作用中靶余核的激发

利用离线γ能谱法，测定了１８．８－４６．２ＭｅＶ／ｕ的￣（１２）Ｃ离子与￣（９３）Ｎｂ相互作用中４３个靶余核的激发函数。这些激发函数随着入射能的变化大体上分为二类，定性显示了熔合－碎裂模型对于热核的类蒸发，类裂变和多破碎三种衰变模式的竞争演化预言的变化趋势。还发现了￣（９２）Ｎｂ￣ｍ的生成截面几乎恒定于５．０×１０￣（３０）ｍ￣２的反常现象。     

SYNTHESIS OF THE RING—AND SIDE—CHAIN—~(14)C—LABELED 1,2—BIS—(4—MORPHOLINOMETHYL—3,5—DIOXOPIPERAZIN—1—YL) PROPANE

The ring-and side-chain-~(14)C-labeled probimane, 1,2-bis (4-morpholinomethy1-3,5-dioxopiperazin-1-yl) propane were synthesized from acetic acid-1-~(14)C in 4 steps and from ~(14)C-formaldehyde in 1 step respectively. The radiochemical yeild for the ring labeling was 28.1%; for the side-chain labeling was 18.5%.