EDTA滴定法测定铜冶炼烟灰中的铅

本文建立了铜冶炼烟灰中铅量的分析方法。样品经氟化氢铵—盐酸—硝酸—高氯酸—硫酸—氢溴酸溶解,在此条件下,砷和锑可以被挥发除去,过滤硫酸铅,沉淀连同滤纸一起在乙酸-乙酸钠缓冲体系溶解,加少许抗坏血酸,三滴二甲酚橙指示剂,2mL巯基乙酸（1+99）,EDTA络合滴定法测定铜冶炼烟灰中的主量铅,滤液中铅量用电感耦合等离子体发射光谱法来进行补正。本文从溶样方式、沉淀条件、乙酸-乙酸钠缓冲溶液的加入量实验、铋干扰消除实验、滤液中铅量的补正实验等多个方面进行研究,选择合理条件范围和消除干扰方法。本实验选取3个样品,将铅铋连续滴定测得铅量和本实验测定铅量进行比对,验证本实验的正确度,加标回收率在99.0～101.5之间,精密度良好,准确度高。     

双极电流滴定法测定废水中铅

双极电流滴定法测定废水中铅肖满田（福建红旗机器厂，３６３０００）铅的污染主要来自选矿、冶炼、蓄电池、电镀等工业废水，铅在人体内会造成严重的积蓄性中毒，因此分析工业废水中铅的含量，控制排放标准是非常有意义的。但铅的分析方法大多采用双硫腙光度法，［１，２...     

以钼酸钠为释放剂选择性螯合滴定法测定铅

论述了以钼酸钠作释放剂选择性螯合滴定法测定铅的方法，应用于测定铅基合金镀层、Ｐｂ－Ｓｎ－Ｃｕ合金镀层和电镀溶液中铅的含量，在选择条件下，金属离子均不干扰测定结果。     

自动光度滴定法测定铅精矿中铅含量

建立了酸消解-自动光度滴定法测定铅精矿中铅含量的方法。用铅精矿有证标准物质验证方法的准确性,回收率为97%～102%,相对标准偏差(RSD,n=11)在0.08%～0.13%。该方法解决了现有检测标准方法手工滴定终点判断困难,误差大等问题。     

锡铅焊料中高含量镉的测定-EDTA络合滴定法

研究了用EDTA络合滴定测定锡铅焊料中高含量镉的方法。对测定条件、溶液酸度、共存离子干扰情况、加标回收率、方法的准确度和精密度考察进行了较全面的讨论。本法可用于锡铅焊料中10％～20％（质量分数）镉的测定。     

铅烟及铅尘污染问题的探讨

介绍我公司铅烟及铅尘的污染状况，阐述了治理污染的基本原理，并从工艺及设备两个方面对如何治理铅污染的问题进行了探讨。     

用废铅泥渣生产铅铬黄颜料

用蓄电池厂生产过程产生的废铅渣生效铬黄颜料，产品质量达到国标规定的指标，具有良好的经济效益和社会效益。介绍了该方法的基本原理，工艺流程和操作步骤。     

氟硼酸电镀铅-锡合金镀液中铅测定方法的改进

以往资料中关于氟硼酸铅-锡镀液成分分析中铅含量的测定结果经实践检验发现大大低于理论值，经多次实验发现另一种测定方法，即用PbSO4沉淀法来测定Pb含量。实验数据表明该方法测定结果十分接近理论值。     

连续滴定法测定硅氟酸电解液中硅氟酸和铅

在电解液中加入饱和硫酸钾,使硅氟酸和铅生成沉淀与其他元素分离,用氢氧化钠滴定硅氟酸后,再用EDTA滴定溶液中的铅。硅氟酸回收率为97.9%~101.3%,铅回收率为97%~102.07%,方法简单,准确,快速,可满足生产的要求。     

骨质瓷釉烧过程中蒸汽降铅的探讨

针对骨质瓷产品在施用硼，铅熔块釉后铅溶出量超标的问题，进行了现状分析与机理探讨，提出了有效的蒸汽铅措施，使合格率达到了100％。     

ICP—OES法测定异辛酸铅中的铅含量

建立了电感耦合等离子体发射光谱仪（ICP—OES）测定异辛酸铅中铅含量的方法。试样经加热分解、蒸干后直接用酸溶解,用ICP—OES仪测定铅含量。此方法的检出限为0．0151μg／mL,相对标准偏差为1．24％-1．60％（n=7）,回收率为99．4％～101．6％。该方法快速、准确、灵敏度高,适用于异辛酸铅中铅含量的测定。     

废铅蓄电池铅膏湿法回收制取氯化铅技术的研究

研究了一种由废铅蓄电池铅膏湿法制取氯化铅的工艺技术。采用HCl-NaCl混合溶液将铅膏中的铅浸出制备氯化铅，考查了冷析滤液的处理方法及循环使用效果。结果表明：采用该工艺技术，铅浸出率达99．3％以上，冷析滤液循环使用4次，铅回收率达到98．2％，制取的氯化铅产品纯度达到了试剂化学纯的要求。     

对铅铬颜料的再认识

通过对铅铬颜料的行业概况、毒性、生产与应用、职业健康与环保等的阐述,让人们深入地了解这个行业。同时表明,不同的铅铬化合物,由于溶解性不同,所以毒性也不同。而铅铬颜料的毒性主要取决于其酸溶性铅、酸溶性铬的大小。     

Volatility of Lead Silicate and Lead Borate Binary Melts

The volatility of binary lead silicate and lead borate melts has been determined at reduced pressures. These systems contain more than 71%, lead oxide. At comparable temperatures, the volatility of the binary lead silicate melt is higher than that of the lead borate of corresponding PbO to boron ratio. The volatilization of PbO is diffusion controlled. The approximate vapor pressure of PbO at 900°C. is 0.2 mm. Hg.     

Leadlead dioxide bielectrodes

Anodic polarization of lead an lead alloys at high cds in chloride solution results in the formation of a thick, voluminous, porous deposit of lead chloride. When a platinum microelectrode is introduced into lead, lead dioxide is formed on the surface of lead in chloride medium during anodic polarization at high cds.As a replacement for costly platinum, lead dioxide pieces which fell during the electrodeposition of lead dioxide were shaped into small cylindrical microelectrodes, inserted into the lead or lead alloys and anodically polarized in chloride solution. In this case lead dioxide is also formed on the surface of the lead or lead alloy. It has been found that the formation of lead dioxide on the leadlead dioxide bielectrode is good in 3% NaCl solution at an anode cd of 3 A/dm² and at room temperature. The effect of withdrawal and insertion of lead dioxide microelectrode, and of the relative area of lead dioxide microelectrode, to lead on the formation of lead dioxide is also studied. Studies on the weight change during anodic polarization of lead and lead alloys embedded with lead dioxide microelectrode, in chloride solution and in synthetic sea water show that leadsilver (1%) alloy is by far the best anode from the point of view of the formation of a compact and crackfree deposit of lead dioxide on the surface.     

含铅玻璃及其无铅化的研究

介绍了铅对人体的危害,综述了一些为限制铅的使用及排放而制定的相关法规,详细介绍了铅玻璃在现阶段中的一些主要用途和目前人们对这些玻璃的无铅化方面的工作。指出电子产品无铅化的迫切性。     

回收铅渣中碳酸铅工艺条件研究

研究了通过纯碱与铅渣中的硫酸铅反应转化为碳酸铅的工艺,得出了该反应的最佳工艺条件为:反应温度为70℃,纯碱浓度为2mol/L,纯碱理论用量为140%,固液比为4∶1,反应时间为4h。在此条件下,铅的浸出率可达94%。     

Antistatic Modification of Lead Styphnate and Lead Azide for Surfactant Applications

Lead styphnate (LS) and lead azide (LA) must be considered vulnerable to accumulation and discharge of static charge under all conditions. To reduce the risk aroused by static initination hazard in the processing and handling of LS and LA, antistatic modifations of LS and LA are necessary. In this paper, four surfactants were applied to improve the antistatic abilities of lead styphnate and lead azide. The results showed that lauryl dimethylamine betaine (BS‐12) is significantly able to reduce the electrostatic accumulation of LS and LA. In addition, possible correlations of electrostatic accumulation with assumption and approximation could be drawn from the surfactant surface concentration. The electrostatic sensitivities, the 5 s delay explosion temperatures, and the thermal decomposition profiles of the compounds were measured. Selected products were additionally investigated by scanning electron microscopy (SEM). For LS the performance of the products with additives was less affected, whereas for LA the sensitivity of the products in the presence of surfactants was distinctly reduced. The surfactants which are preferably compatible with LS and LA do not affect their thermal stability.     

KDNP – A Lead Free Replacement for Lead Styphnate

Efforts directed towards creating new environmentally friendly replacements for existing primary explosives have resulted in development of potassium 5,7‐dinitro‐[2,1,3]‐benzoxadiazol‐4‐olate 3‐oxide (KDNP). The chemical and physical properties of this material have been investigated and it appears that KDNP is a suitable drop‐in replacement for lead styphnate in a variety of ordnance applications. KDNP is easily prepared, has excellent thermal stability and has safety and performance properties, which are equivalent to or exceed those for lead styphnate. KDNP has been qualified for military use per NAVSEAINST 8020.5C.     

含铅低温玻璃釉料表面析铅的研究

以PbO-B2O3-SiO2系统为基础,在PbO质量分数为60%时,对釉料表面析铅问题进行了研究。结果表明,析铅的实质是釉料表面被空气中所含水分侵蚀,Pb2+在釉料中的结构受到破坏,与H2O和CO2发生反应,形成了碱式碳酸铅。