电位滴定法测定钙奶中钙含量

提出了以钙离子选择性电极为指示电极，甘汞电极为参比电极，EGTA标准溶液为滴定剂的电位滴定法测定钙奶中钙含量，滴定终点由电位突跃来判断，此法简便，灵敏，准确，相对标准偏差为0.16%。加标回收率为99.0%-100.%，可用于直接测定混浊或有色液体中钙含量。     

自动电位滴定法测定甲醛含量

用自动电位滴定测定甲醇生产装置废水和季戊四醇生产副产品甲醇中的甲醛含量 ,采用预设终点模式和动态滴定模式互补来实现分析中的中和滴定和含量测定两步过程 ,用 pH =6 .8、pH =9.2两种缓冲溶液对电极进行两点校准。试验结果标准偏差 0 0 5 1,加标回收率 94.0 %～ 98.0 %。测定快速、准确     

电位滴定法测定丁基硼酸的含量

目的：建立一种丁基硼酸起始物料的含量测定检测方法。方法：采用电位滴定法,用氢氧化钠滴定液进行滴定。结果：本方法空白试验溶液消耗滴定液体积为0.000 mL,对供试品滴定终点的判断无干扰,供试品滴定过程中有明显、单一的滴定突跃,专属性良好;重复性试验和中间精密度试验RSD均小于1.0%;在供试品约0.12～0.48 g范围内线性关系良好,r=0.999 9;含量回收率应在98%～101%,6份含量测定结果的RSD小于1.0%,准确度良好;分别对水浴加热时间、水浴温度、双氧水用量、D-甘露醇用量和滴定杯溶液总体积等五个因素各三个水平进行了分析方法的耐用性考察,各组考察因素下三个不同水平含量测定结果的RSD均小于1.0%,耐用性良好。结论：该方法操作简便、准确度好、精密度高、耐用性优良,可用于本品的含量检测。     

控制电位滴定法测定硫酸沙丁胺醇含量

用酸碱控制电位滴定法对硫酸沙丁胺醇片的含量进行了测定。比较了氢氧化钠或盐酸作滴定剂的测定结果,探讨了工作电位的选择与测量误差之间的关系,研究了片剂中辅料对测定结果的干扰。本法测定结果与《中国药典》2010年版高效液相色谱法测定结果的偏差约为1.5%。     

电位滴定法测定对羟基苯甲醛

本文介绍了电位滴定法测定对羟基苯甲醛的原理、测定步骤和滴定终点的选择依据。方法简便易行,准确度达到工业分析要求。     

电位滴定法测定电泳漆槽液中锌离子含量

取一定量的电泳漆槽液，用蒸馏水稀释后，加入醋酸铵缓冲溶液，使溶液ｐＨ＝６．５～６．８。以铜离子选择电极为指示电极，饱和甘汞电极为参比电极，用铜试剂标准溶液进行电位滴定。用二级微商法计算滴定终点，而间接求出电泳漆槽液中Ｚｎ＾２＋的含量。以铅离子选择电极为指示电极，用硝酸铅标准溶液进行电位滴定，用类似的方法即可测定电泳漆槽液中ＰＯ＾３－４的含量。     

电位滴定法测定回收废料中钴的含量

介绍一种适用于回收废料中钴含量测定的铁氰化钾电位滴定法,方法的标准偏差Ｓ小于０．１５,回收率９９．４％￣１００．７％。     

电位滴定法测定异辛酸钴中的钴含量

本文提出了一个测定钴的新方法。以钴标准溶液为滴定剂 ,铂电极为指示电极 ,甘汞电极作为参比电极 ,利用电位的突变来指示终点。具有灵敏、准确、快速等特点     

电解法合成香兰素

本文利用草酸的电解液合成了4-羟基-3-甲氧基扁桃酸,经进一步电解氧化合成了香兰素,获得了满意的结果。     

非水滴定法测定阔草清含量的研究

建立了用非水滴定法测定阔草清含量的方法。实验方法为:精确称取阔草清0.23g,加20mLDMF,加2滴百里香酚兰指示剂,用甲醇钠标准溶液滴定至溶液由黄色变为蓝色,电位滴定法与指示剂法的测定结果一致,此方法操作简便,滴定终点清晰,准确可靠,重现性好。     

返滴定法测定氯化钾无氰镀镉溶液中氯化镉

制定了氯化钾无氰镀镉溶液中氯化镉的返滴定分析方法,在强酸性和加热条件下用过硫酸铵氧化镀液中的配位剂,使镉离子从配合物中释放出来。用氟化钠掩蔽Al³⁺和Sn⁴⁺杂质,用三乙醇胺掩蔽Fe³⁺杂质。加入过量的EDTA标准溶液配位Cd²⁺,在pH≈9.3的条件下,以铬黑T作指示剂,用硫酸锌标准溶液返滴定EDTA,用差减法计算镀液中氯化镉的质量浓度。结果表明,测定结果的相对平均偏差为0.19%,回收率为98.03%。     

络合滴定法测定钾钙肥中有效CaO指示剂的探讨

以钾钙肥中钙含量的测定方法为研究对象,分别将CMP、K-B和钙指示剂用于EDTA络合滴定法测定钾钙肥中有效氧化钙,比较了3种指示剂的精密度和准确度,讨论了实验数据和测定结果。结果表明,3种指示剂都可用于络合滴定法中测定钾钙肥中有效氧化钙的含量,其中CMP和K-B指示剂测定结果优于钙指示剂。     

酸碱滴定中林邦误差公式的推导及应用

对酸碱滴定法中林邦误差公式进行了推导,并对其进行了详细的讨论;同时,给出了具体应用实例.     

EDTA络合滴定钙、镁方法的改进

研究了用改进的ＥＤＴＡ络合滴定直接测定钙、镁的方法,即用乙酰丙酮掩蔽镁测定钙和用草酸钙沉淀除钙后直接测定镁的方法。结果表明,该新方法简单、快速、准确度和精密度高。     

Electrolytic aggregation treatment without coagulant dosage for retentate

An electrolytic treatment promoting aggregation compatible with the production of a dense aggregate was developed and studied in a batch test to thicken the retentate without coagulant dosage. A kaolin suspension with turbidity of about 200 NTU with a large fraction of fine particulates was used as the retentate. The aggregation of the electrochemically treated suspension increased with increasing mixing intensity in the range of 40–160 rpm for 5 min. The electrolytic treatment could also decrease the residual turbidity at the retention of about 150 h to one-fourth that of the untreated suspension, and moreover did not significantly change the sludge concentration, in contrast to the decreased sludge concentration of the acidified suspension maintained in the pH range of 4.5–5.0. A positive shift of the surface charge of particulates observed in the treated suspension suggests that the particle destabilization occurred in a pH range of 5.5–7.0, because of the hydrolysis of Al ions released electrochemically from kaolin clay.     

A Greener Alternative Titration Method for Measuring Acid Values of Fats,Oils, and Grease

A greener alternative method is proposed for measuring acid values (AV) of fats, oils, and grease (FOG) based on visual titration. Compared with Official Method Cd 3d-63 of the American Oil Chemists' Society (AOCS), this greener alternative method can eliminate the use of toluene, which in turn reduces toxicity and cost. A total of 44 samples of yellow and brown grease with AV ranging from 0.13 to 170.37 (mg KOH) g⁻¹ were titrated using both methods. The alternative titration method can provide accurate and reliable results to determine the AV of FOG by various statistical analyses including repeatability, linear regression, f-test, t-test, and method accuracy calibration with AOCS Cd 3d-63. This low-cost method can be recommended for routine titration in research and development, and in biodiesel plants for most FOG samples.     

Titration Calorimetry Standards and the Precision of Isothermal Titration Calorimetry Data

Current Isothermal Titration Calorimetry (ITC) data in the literature have relatively high errors in the measured enthalpies of protein-ligand binding reactions. There is a need for universal validation standards for titration calorimeters. Several inorganic salt co-precipitation and buffer protonation reactions have been suggested as possible enthalpy standards. The performances of several commercial calorimeters, including the VP-ITC, ITC200, and Nano ITC-III, were validated using these suggested standard reactions.     

酸碱滴定测定甲胺基乙腈

本法研究了用盐酸标液作滴定剂 ,在中性盐溶液中测定甲胺基乙腈。其结果与经典的凯氏定氮法一致。本法具有准确可靠、精密度高 ,操作简便快速等特点。