高碘酸钾氧化吖啶橙催化荧光法测定痕量锰

本文研究了在弱酸性介质中,以氨三乙酸为活化剂,高碘酸钾氧化吖啶橙;催化荧光法测定痕量锰的新体系.方法检出限为0.1ng/ml,线性范围为0～8.5ng/ml.该方法选择性好,操作简便.直接用于水样和人发样中锰的测定,结果满意.     

表面活性剂存在下铋酸钠作氧化剂分光光度法测定微量锰

本文研究了在表面活性剂CPC存在下,用铋酸钠作氧化剂,碘溶液间接分光光度法测定微量锰的分析方法及最佳条件。该法对0.00～1.00ug/ml范围内的锰呈良好的线性关系,摩尔吸光系数为7.8×10~4升·摩尔 厘米,应用于茶叶、大米与咖啡中锰含量的测定,结果与原子吸收法基本一致。样品分析结果,相对标准偏差<2.5％,回收率95～102％。     

原子吸收分光光度法测定人发中的微量锰

本文叙述了采用浓硝酸－高氯酸湿法消化人发样品，原子吸收分光光度法测定样品中的微量锰的方法．该方法简便快速、灵敏可靠．用本法测定了上海地区发样中锰的含量，其发中锰的平均含量为３．３０×１０－６ｇ／ｇ．此法的检测极限为０．０１×１０－３ｇ／Ｌ，相对标准偏差为２．４４％．结果较为满意．     

掺钒电解二氧化锰的放电特性及其某些理化性能(Ⅰ)

掺钒电解二氧化锰(EMD-V)样品是在合有VOSO_4的H_2SO_4-MnSO_4溶液中通过阳极氧化制备的。EMD-V样品在中性NH_4Cl-ZnCI_2电解质中的放电性能优于未掺杂EMD样品。X射线衍射图表明,EMD-V样品属于γ型MnO_2,具有纤维态结构。X射线光电子能谱分析表明,钒在EMD-V样品中以V_2O_5的形式存在。     

液膜分离富集－电感耦合等离子体原子发射光谱法测定痕量锌和锰

通过Ｐ２０４－Ｓｐａｎ８０－煤油－ＨＣｌ和Ｐ２０４－ＴＯＡ－煤油－ＨＣｌ液膜体系分离和富集痕量Ｚｎ２＋和Ｍｎ２＋，并采用正丁醇化学破乳及电感耦合等离子体原子发射光谱法对其进行了测定，回收率为９２％～１０２％．     

中锰白口铸铁激冷组织及热塑性变形规律的试验研究

【摘要】在激冷条件下探讨了锰白口铸铁成份与组织的关系，确定了合适的成分范围，研究了锰白口铸铁的热塑性变形能力，并测定了温度与临界变形率的关系曲线。此外，对该材质的铸态和塑变态的抗磨性以及冲击性能做了对比试验。结果表明，中锰多元白口铸铁具有较宽的变形温度区间，在８５０℃变形量已超过５５％，显示出良好的热塑性变形能力，经高温塑性变形，碳化物成孤立块状分布在基体中，从而使冲击韧性得到改善，塑性变形后仍具有良好的抗磨性     

Systematically controlled synthesis of rGO/nano-MnO_x materials for supercapacitors

The effects of hydrothermal production conditions on crystal forms,morphology and electrochemical performance of in situ reduced graphene oxide/manganese oxides(r GO/Mn O_x)hybrid electrode materials were studied.The XRD/SEM results show that the ratio of precursors,reaction temperature and type of solvent significantly affected the crystal form obtained and nano-structure of MnO_x.Varied precursor ratios of KMnO_4:GO(5:1,7:1,9:1 and 11:1)yielded the hybrids of rGO/Mn_7O_(13)5H_2O,rGO/β-MnO_2,rGO/Mn_(98)O_2,and rGO/K_(0.27)MnO_2(H_2O)_(0.54),respectively,having corresponding nano structures of nano-sheets composed petal-like shape,petal-like shape based nano-wire clusters,petal-like shape with backwardly arched top and bigger mesoporous petal-like nano structures.Hybrid prepared precursor with the ratio of 5:1 exhibited the highest specific capacitance of 320 F/g at 0.2 A/g and the smallest diffusion impedance.However,hybrid prepared precursor with the ratio of 7:1 presented the lowest electron transfer impedance.Varying hydrothermal treatment temperatures(140,160 and 200℃)yielded hybrids:rGO/MnO(OH),rGO/Mn_(0.91)O_(1,82)(H_2O)_(0.18),and rGO/Mn_7O_(13)5H_2O,respectively.The nano structures of the hybrids were nano-sheets having petal-like mesoporous structure,but having larger dimensions as temperature increase.The hybrid prepared at 160℃ showed the highest specific capacitance of 214 F/g at a current density of 0.2 A/g and the lowest solution resistance of1.61Ω,whiles,the hybrid prepared at 140℃ inferred the best cyclic reversibility.     

锗硅酸盐中Mn^2＋的发光性质研究

合成了组成的为（Ｚｎ，Ｍｇ）２（Ｓｉ，Ｇｅ）Ｏ４：Ｍｎ＾２＋的绿色荧光材料，在紫外光激发下有较强的５３２ｎｍ发射。低浓度镁能增强５３２ｎｍ发射，高浓度镁却能抑制５３２ｎｍ发射，而增强６３１ｎｍ红光发射。探讨了Ｍｎ＾２＋的发光性质与基质的晶体结构及组成的关系，计算了Ｍｎ＾２＋离子能级和晶体场参数。     

银、铜、锰对日本沼虾的急性致毒剂量

Ag(Ⅰ)对白洋淀日本沼虾的24h LC_(50)为0.024mg/L,48h LC_(50)为0.014mg/L,安全浓度为0.0014mg/L;Cu(Ⅱ)对这种虾的24h LC_(50)为0.600mg/L,48h LC_(50)为0.400mg/L,安全浓度为0.053mg/L;而Mn(Ⅱ)对该虾的24h LC_(50)》32mg/L。上述研究结果,为渔业水质标准的修订和补充以及水质的评价提供了科学依据。