新形势下住宅小区休闲空间景观设计

随着我国国民经济发展水平的不断提高,人民对于居住环境的质量要求也越来越高,特别是住宅小区的环境优劣对于人们生活的健康有着非常重要的影响,同时也是一个城市文化的体现。对于住宅小区的开发应当充分重视休闲空间景观设计,促进住宅小区的环境朝着更加美好的方向发展。     

曙红Y褪色光度法测定盐酸普罗帕酮

在pH=3.2的HCl-NaAc缓冲溶液中,曙红Y(EY)与盐酸普罗帕酮(PPF)形成1∶1的离子缔合物,导致溶液的吸收光谱变化,在518 nm处产生明显的褪色作用,并在550 nm处出现新的吸收峰.PPF的质量浓度在0.2～4.0 μg/mL范围内与褪色波长处的吸光度变化值呈良好的线性关系,据此建立一种测定PPF的分光光度新方法.方法简便快捷,灵敏度较高,摩尔吸光系数(ε)为4.16×104 L/(mol·cm).研究了适宜的反应条件和影响因素,并考察了共存物质的影响,表明方法具有较好的选择性,可用于PPF片剂含量测定.     

共振瑞利散射法测定水产品中孔雀石绿

在pH=4.4的HC1-NaAc缓冲介质中,孔雀石绿(MG)以及钨酸盐溶液自身的共振瑞利散射(RRS)均十分微弱.但是当MG染料阳离子与钨酸根(WO42-)形成离子缔合物时,RRS急剧增强,并出现新的RRS光谱,其RRS峰分别位于339 nm,451 nm和591 nm处.在最大散射波长339 nm处.孔雀石绿浓度在0.060～2.8 μg/mL范围与散射增强(ΔⅠ)呈良好线性关系,因此可用于痕量孔雀石绿的测定.方法灵敏度高,检出限为18.1 ng/mL.本法用于鱼肉中孔雀石绿残留量的测定,结果满意.

Abstract：

In an experiment reported in this paper, the resonance Rayleigh scattering (RRS) of malachite green (MG) or tungstate anion was very weak in pH 4.4 HC1-NaAc buffer medium, but when MG cation reacted with WO42- anion to form an ion association complex, its RRS dramatically increased and a new RRS spectrum appeared with the RRS peaks at 339 nm, 591 nm and 451 nm. The intensity of RRS (ΔⅠ)was directly proportional to the concentration of malachite green in the range of 0.06-2.78 μg/mL at the maximum scattering peak of 339 nm. The method was shown to be sensitive and the detection limit for MG was 18.1 ng/mL. Thus a new method for the determination of MG was developed. When applied to the determination of malachite green residues in the flesh of fish, this method gave satisfactory results similar to those of the HPLC method.     

氯化钡共振瑞利散射法测定蜂蜜中硫酸链霉素残留

在0．05mol／LHCl和2．0mg／mL Triton X-100介质中,氯化钡与硫酸链霉素（STP）在加热条件下反应生成BaS04微粒,导致溶液的共振瑞利散射（RRS）强度急剧增强,并产生新的RRS光谱,最大散射峰位于338nm附近．在0．01～4．0ug／mL浓度范围内,反应体系RRS强度与药物浓度成正比．反应具有较高的灵敏度,对STP的检出限（3a）为4．8ng／mL．研究了适宜的反应条件和影响因素,并考察了共存物质的影响,表明方法具有较好的选择性,可用于蜂蜜中STP残留的检测．     

二卤代荧光素阿曲库铵体系的吸收光谱及其分析应用

在弱酸性Britton-Robinson缓冲溶液中,阿曲库铵(AB)与二氯荧光素(DCF)、二溴荧光素(DBF)、二碘荧光素(DIF)形成离子缔合物,引起这3种染料的最大吸收峰明显降低,并在532 nm(DCF体系)、540 nm(DBF体系)和551 nm(DIF体系)处出现新的吸收峰.在一定范围内,AB浓度与吸光度的改变值(ΔA)成良好的线性关系,不同体系的摩尔吸光系数(ε)在9.95×103~1.22×105L/(mol.cm)之间.据此,提出了测定AB的新分光光度法,并考察了体系的光谱特征、适宜的反应条件和共存物质的影响.将该方法用于尿样中AB的测定,回收率在97.6%~104.4%之间.     

铊(Ⅲ)-赤藓红体系分光光度法测定万古霉素

在pH为5.3～5.5的乙酸-乙酸钠缓冲液中, 铊(Ⅲ)能氧化赤藓红而使之褪色, 其最大褪色波长位于526 nm处, 而加入万古霉素能抑制该褪色反应的进行. 基于此反应, 发展了一种简便, 灵敏和快速的测定万古霉素的分光光度法. 该方法线性范围0.2～2.0 μg/mL, 摩尔吸光系数7.02×105 L/(mol·cm), 检出限66.0 ng/mL. 文中考察了方法适宜的反应条件和影响因素, 检验了共存物质的影响, 表明方法具有良好的选择性, 可应用于市售万古霉素针剂中万古霉素含量测定.     

高锰酸钾共振瑞利散射法测定磺胺二甲嘧啶

在0.2 mol/L H_2SO_4介质中,磺胺二甲嘧啶(SM_2)和KMnO_4在加热条件下发生氧化还原反应生成MnO_2微粒,导致共振瑞利散射(RRS)增强,并产生新的散射峰.其最大散射波长位于595 nm附近,散射强度在一定范围内与SM_2的浓度成正比,据此建立了测定SM_2的共振瑞利散射(RRS)新方法.本方法具有较高的灵敏度,检出限为8.6 ng/mL.实验优化了测定条件.考察了共存物质的影响,表明方法具有良好的选择性,用于片剂中SM_2的测定,结果满意.

Abstract：

In 0.20 mol/L H_2SO_4 medium, a redox reaction took place between sulfadimidine (SM_2) and po-tassium permanganate to form MnO_2 particles by heating.As a result, new spectra of resonance rayleigh scattering appeared and their intensities were enhanced greatly.The maximum peak of RRS was located at approximately 595 nm, and the scattering intensities were proportional to the concentration of SM_2.Based on these results, a new method for the determination of SM_2 was established.The detection limit (3σ) was 8.6 ng/mL.The effects of coexistent substances were tested, and the results demonstrated that this meth-od had good selectivity.It has been applied to the determination of SM_2 in tablets with satisfactory results.     

刚果红分光光度法测定链霉素

在pH=5 0 的Britton-Robinson缓冲溶液中, 链霉素与刚果红形成离子缔合物, 导致溶液的吸收光谱变化, 在 497 nm处产生明显的褪色作用. 链霉素浓度在0 01～2 8 μg/mL的范围内与吸光度值呈良好的线性关系. 据此建立了测定链霉素的分光光度法, 摩尔吸光系数(ε)为 1 19×105 L/(mol·cm). 研究了适宜的反应条件和分析化学性质, 将方法用于尿样和蜂蜜中链霉素残留量测定, 结果满意.     

牛血清白蛋白共振瑞利散射和共振非线性散射法测定硫酸软骨素

在pH=2.8～4.0的BR缓冲溶液中,硫酸软骨素(CS)由于磺酸基离解而成为带多个负电荷的大阴离子,而低于其等电点(pI=4.7)的牛血清白蛋白(BSA)则以带正电荷的大阳离子存在,两者之间可结合形成复合物.此时将引起共振瑞利散射(RRS)显著增强,并产生新的RRS光谱,其最大散射波长位于304 nm处.与此同时,它的二级散射(SOS)和倍频散射(FDS)也明显增强,且最大SOS和FDS分别位于471 nm和292 nm.散射增强的强度(△I_(RRS)、△I_(SOS)和△I_(FDS)与CS浓度在一定范围内成正比,可用于CS的定量测定.对于CS的检出限(3σ)分别为2.0 ng/mL(RRS),2.9 ng/mL(SOS)和13.2 ng/mL(FDS).研究了适宜的反应条件,考察了共存物质的影响,表明方法有较好的选择性,可用于市售滴眼液中硫酸软骨素含量的测定.

Abstract：

In a Britton-Robinson (BR) buffer solution of pH 2.8--4.0, chondroitin sulfate (CS), which carries negative charge by the ionization of sulfonie group, reacted with bovine serum albumin, which car-ries positive charge through electrostatic force and hydrophobic interaction, to form a complex, resulting in a significant enhancement of resonance Rayleigh scattering (RRS) and the appearance of a new RRS spectrum with the maximum wavelength at 304 nm.At the same time, the second-order scattering (SOS) and frequency-doubling scattering (FDS) were enhanced obviously with a peak at 471 nm and 392 nm, re-spectively.The intensity of scattering (△I_(RRS), △I_(SOS) and △I_(FDS)) was directly proportional to the concentra-tion of CS in a certain range.When used in CS determination, this method exhibited high sensitivity, with a detection limit of 2.0(RRS), 2.9(SOS) and 13.2(FDS) ng/mL.The optimum conditions for the reac-tion and the influencing factors were investigated.The interference of foreign substances was examined and this method showed a good selectivity.The method can be applied satisfactorily to the determination of CS in eye drops.     

肉羊养殖中存在的问题及对策

随着生活水平的不断提升,人们对羊肉的需求量不断增加,尤其在冬季需求量更大。为了满足市场需求,肉羊养殖规模不断扩大,问题也随之而来。为此,本文叙述了肉羊养殖中存在的问题:过分重视产量而忽略质量,缺乏防疫意识、疾病频繁发生,缺乏资金支持,产业链不完善。提出了对应策略:重视肉羊养殖、提高羊肉品质,做好疾病防控、营造健康环境,完善产业体系,保障经济效益。