Electrochemical Recovery and Behaviors of Rare Earth (La,Ce, Pr,Nd, Sm,Eu, Gd,Tb, Dy,Ho, Er,Tm, and Yb) Ions on Ni Sheets

The electrochemical behaviors of rare earth (RE) ions have extensively been studied because of their high potential applications to the reprocessing of used nuclear fuels and RE-containing materials. In the present study, we fully investigated the electrochemical behaviors of RE(III) (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) ions over a Ni sheet electrode in 0.1 M NaClO₄ electrolyte solution by cyclic voltammetry between +0.5 and −1.5 V (vs. Ag/AgCl). Amperometry electrodeposition experiments were performed between −1.2 and −0.9 V to recover RE elements over the Ni sheet. The successfully RE-recovered Ni sheets were fully characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy. The newly reported recovery data for RE(III) ions over a metal electrode provide valuable information on the development of the treatment methods of RE elements.     

张兰教授治疗早期糖尿病肾病临证例析

张兰教授认为,早期糖尿病肾病核心病机为脾肾两虚兼血瘀,强调治疗重在健脾益气,补肾活血。     

新型含硫酰基吡唑啉酮席夫碱稀土配合物的合成与结构表征

目的 :含硫席夫碱配合物的研究。方法 :在无水溶剂中 ,通过溶解、回流合成了未见报道的吡唑啉酮席夫碱两种稀土金属配合物。对所合成的配体和配合物进行了元素分析、电子光谱、红外光谱、差热—热重 ,并辅电导测定 ,从而初步确定了它们的分子结构式。结果 :通过分析可以基本得到稀土配合物的分子式和结构 :ML3(NO- 3) 3.3H2 O。结论 :得到所合成配合物。     

Direct electrochemistry and electrocatalysis of complex of horseradish peroxidase and La(III) at nano-gold colloid/cysteine/gold electrode

In this paper, the measurement results of sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS–PAGE), matrix-assisted laser desorption/ionization time-of-flight mass (MALDI–TOF/MS) spectroscopy and inductively coupled plasma mass spectrometry (ICP-MS) demonstrated that the complex of horseradish peroxidase (HRP) and La(III) (La–HRP) can be formed in horseradish in vivo after horseradish is treated with 80 μM La(III). The electrochemical measurements further demonstrated that the direct electrochemical performance and the bioelectrocatalytic activity of the La–HRP complex are worse than that of HRP. This means that when HRP is treated with the high concentration of La(III), the natural function of HRP is inhibited due to the change in the structure of HRP. Thus, it would be harmful for horseradish and other organisms. This result would provide some references for better understanding the toxicity mechanism of rare earth elements and heavy metals in the organisms.     

稀土分离行业职业病危害识别与关键控制点分析

目的 分析某稀土分离公司生产过程中存在的职业病危害因素及其危害程度,确定职业病危害的关键控制点。方法 采用职业卫生调查、职业卫生检测、职业健康检查等方法进行职业病危害因素识别。结果 该厂存在化学毒物、噪声、粉尘、高温、电离辐射等职业病危害因素。现场检测结果显示个体噪声检测强度为78.4-87.8dB（A）,超标率为25.0%;其余职业病危害因素的浓度或强度均符合国家职业接触限值,该厂职业病危害关键控制点为盐酸、噪声和粉尘相关岗位。结论 该厂职业病危害因素较多,应在职业病危害因素关键控制点加强职业病防治工作。     

Synthesis and Biological Evaluation of Fatty Hydrazides of By-products of Oil Processing Industry

Some new 2-alkyl-5-mercapto-1,3,4-Oxadiazoles and 3-alkyl-5-mercapto-1,2,3-4H triazoles were synthesized from hydrazides of acid oil and oil recovered from spent bleaching earth. These newly synthesized compounds were characterized on the basis of elemental analysis and evaluated for biological properties. Certain derivatives exhibited fairly high antibacterial and antifungal activities when compared with streptomycin and immidil used as standard antibacterial and antifungal agents respectively.     

The Effect of Electrochemical Composite Coatings with LaF3-LaB6 Particles in Nickel–Copper Matrix on the Metallurgical Processes in Arc Welding of Low Alloy Ferrite-Pearlite Steels

Development of welding consumables with fluorides and borides of rare earth metals is a promising area for improving the weldability of low alloy steels. As lanthanum fluoride and boride dissociate, lanthanum and boron dissolve in the weld pool and the welding arc plasma is saturated with fluorine. As a result of FeO, MnO, SiO₂ deoxidation and FeS, MnS desulfurization, refractory lanthanum sulfides and oxides La₂O₃, La₂S₃ are formed in the weld pool, which can be the crystallization nuclei in the weld pool and the origin of acicular ferrite nucleation. The paper proposes a model of metallurgical processes in the arc and weld pool, as well as a model of electrochemical adsorption of Ni²⁺ cations in colloidal electrolytes during electrostatic deposition of nano-dispersed insoluble particles of LaF₃ or LaB₆ on the surface of wire. The paper discusses the constructional design of the welding wire and the technology for forming electrochemical composite coatings with copper and nickel matrix. The composite wires applied in the welding of low alloy steels make it possible to refine the microstructure, increase the tensile strength by 4% and the impact toughness of welds by 20%.     

Association of blood chromium and rare earth elements with the risk of DNA damage in chromate exposed population

Pollution of heavy metals often occurs in combination with multiple metal ions. Whether the genetic damage among chromate exposed population correlated with rare earth elements (REEs) was still not well elucidated. A total of 291 participants from a chromate production plant were recruited in the present study. The DNA oxidative damage was evaluated by urinary 8-hydroxydeoxyguanosine (8−OHdG) and the concentrations of chromium (Cr) and 15 REEs accumulated in the peripheral blood of participants were determined. The results showed that significant DNA oxidative damage was observed in chromate exposed workers. Blood REEs levels in the exposed group were significantly higher than the control group and blood REEs increased in a concentration dependent manner with Cr. Additionally, significant correlations were observed between blood Cr and 10 REEs concentrations. Blood Cr had a significant positive correlation with urinary 8−OHdG. Blood Cr and Yttrium had a positive interactive effect on urinary 8−OHdG. Collectively, the results suggested workers who had been working in the chromate plant were simultaneously exposed to chromate and a variety of REEs, which could have interactive effects on the DNA damage of workers.     

扶土生金康复方治疗COVID-19恢复期肺脾不足证患者临床观察

目的?观察扶土生金康复方治疗新型冠状病毒肺炎（COVID-19）恢复期肺脾不足证患者的中医证候疗效及对免疫学等相关指标的影响。方法?将120例COVID-19恢复期肺脾不足证患者分为治疗组89例和对照组31例,治疗组给予扶土生金康复方治疗,对照组无任何干预措施,疗程为14?d。观察2组治疗前后中医证候积分变化情况,并比较2组总有效率。观察2组治疗前后体液免疫和T淋巴细胞亚群相关指标变化情况。结果?治疗后治疗组中医证候积分总有效率为94.38%,高于对照组54.84%（P<0.01）。治疗组IgA、补体C3水平明显降低（P<0.01）,IgG、IgM水平明显升高（P<0.05）,与对照组比较,IgM、补体C3水平有显著性差异（P<0.05~0.01）。治疗组CD3、CD4、CD8百分比明显升高（P<0.01）,与对照组比较,CD3、CD4百分比有显著性差异（P<0.05）。结论?扶土生金康复方能够有效改善COVID-19恢复期肺脾不足证患者的中医临床症状,并且能较好地改善患者免疫功能。      

稀土氧化钕粉尘致大鼠肺纤维化过程中Ⅰ、Ⅲ型胶原及白介素-12表达的变化

目的探讨稀土氧化钕粉尘的致纤维化过程中Ⅰ、Ⅲ型胶原纤维、白介素-12（IL-12）表达的变化特征。方法选用SPF级健康成年雄性SD大鼠70只,体重（200±16）g,采用气管非暴露插管灌注法进行染尘建立模型。实验组按25、50、100、150（mg/kg）稀土氧化钕粉尘悬液0.8 ml一次性染尘,对照组0.9%生理盐水0.8 ml。在28 d后实验组各处死大鼠15只,对照组处死10只。酶联免疫吸附试验（ELISA）法分别测定实验组大鼠支气管肺泡灌洗液（BALF）上清液中IL-12含量;肺组织采用天狼猩红染色,偏光显微镜下观察Ⅰ、Ⅲ型胶原纤维。结果稀土氧化钕粉尘致实验大鼠肺组织纤维化过程中可见Ⅰ、Ⅲ型胶原纤维的大量增生,染尘后早期主要以Ⅰ型胶原纤维增生为主。其Ⅰ、Ⅲ型胶原纤维增加与对照组比较差异均有统计学意义（P〈0.05）。在实验组中大鼠BALF上清液中IL-12随着染尘剂量的增加而逐渐增多,含量均高于对照组（P〈0.05）。结论稀土氧化钕粉尘在诱导大鼠肺部组织纤维化过程中,Ⅰ、Ⅲ型胶原纤维均大量增多,分布范围扩大。同时BALF上清液中IL-12出现高表达,表明IL-12在肺组织纤维化发生和发展过程中具有一定的作用。