计算溶液所需的质量、体积或浓度。
钙红指示剂(NN)
有货
为什么选择此级别
BioReagent,指示剂 级 ，适用于对基线干扰要求严格的色谱和分析工作流程。
储存与运输
室温。常规运输 。请查阅批次 COA 获取详细规格。
质量文档
SDS、COA、产品数据表及规格说明书均可下载。可通过批号查询获取批次 COA。
文献证明
在色谱分析、有机合成和交叉偶联反应领域已被 0 篇同行评审文献引用。
概述
指示剂 (Indicator) 是一种辅助试剂，是化学试剂中的一类；可用于检验溶液的酸碱性、滴定分析中用来指示滴定终点、环境检测中检验有害物质等。在一定介质条件下，其颜色能发生变化、能产生浑浊或沉淀、发生荧光现象等。根据发生的化学反应的不同，指示剂的种类也不相同，包括酸碱指示剂、氧化还原指示剂、金属离子指示剂、吸附指示剂、荧光指示剂等。其中最常用的是酸碱指示剂。在滴定分析中，用标准溶液对被测溶液进行滴定，当反应达到完全时，两者以相等当量化合，这一点称为等当点。准确地确定等当点是滴定分析的关键。通常是指示剂颜色的突变作为等当点到达的信号。在滴定过程中，随着滴定剂的加入，被测溶液和标准溶液的浓度都在不断变化，在等当点附近，离子浓度会发生较大变化，此时溶液颜色发生变化或生成沉淀等。如果标准溶液或被测溶液是有色的，它们本身就具有指示剂的作用，如高锰酸钾等。
钙红，又称钙试剂羧酸；钙红指示剂；钙羧酸，钙指示剂；3‑羟基‑4‑[(2‑羟基‑4‑磺基‑1‑萘基) 偶氮]‑2‑萘羧酸；1‑(2‑羟基‑4‑磺基‑1‑萘偶氮)‑2‑羟基‑3‑萘甲酸；2‑羟基‑1‑(2‑羟基‑4‑磺基‑1‑萘基偶氮)‑3‑萘甲酸；钙羧酸指示剂。
钙红指示剂 (NN) 由钙指示剂 (钙红 / 钙羧酸)、甲醇等组成，是常用的金属离子指示剂 (钙离子指示剂)，用于配位滴定分析实验，终点颜色变化为：红‑蓝。 NN 的性质和铬黑 T 很相近，在不同的 pH 值其颜色变化：在 pH 8~13 范围内呈蓝色，pH 大于 13.2 或小于 7.5 呈粉红色。钙红指示剂能与 Ca²⁺ 形成红色配合物，在 pH=13 时，可用于钙镁混合物中钙的测定，终点由红色变为蓝色。颜色变化敏锐。在此条件下，Mg²⁺生成 Mg (OH)₂沉淀，不被滴定。钙红指示剂和铬黑 T 一样，也受 Cu²⁺、Ni²⁺、Co²⁺、Al³⁺、Fe³⁺、Ti⁴⁺等离子的封闭，可用硫化钠、氰化钾或三乙醇胺进行消除。
操作步骤 (仅供参考)：
1、按实验室具体要求操作。通常指示剂的用量为每 10 mL 试液加入 1 滴 (0.05‑0.1 mL) 指示剂。
2、滴定终点颜色变化：红色→蓝色。
注意事项：
1、指示剂用量过多，会使变色范围向 pH 值减小的方向移动；同时指示剂变色会消耗一定量滴定剂，增大测定误差，并降低变色敏锐性。
2、不同类型指示剂的推荐用量不同，通常酸碱指示剂用量为每 10 mL 试液使用 1 滴 (0.05‑0.1 mL) 指示剂。
3、为了您的安全和健康，请穿实验服并佩戴一次性手套进行操作。
4、试剂开封后请尽快使用， 以免影响后续实验效果。
5、本产品仅用于科研领域，不适用于临床诊断或其他用途。
Indicator is a type of auxiliary chemical reagent. It can be used to test the acidity‑alkalinity of solutions, indicate titration endpoints in titrimetric analysis, and detect harmful substances in environmental monitoring. Under certain medium conditions, it may change color, produce turbidity or precipitate, or generate fluorescence. Depending on the chemical reaction involved, indicators are classified into acid‑base indicators, redox indicators, metal‑ion indicators, adsorption indicators, fluorescent indicators and so on. Among them, acid‑base indicators are the most widely‑used.In titrimetric analysis, a sample solution is titrated with a standard solution. When the reaction is complete, the two substances react in equivalent amounts, and this point is defined as the equivalence point. Accurate determination of the equivalence point is critical for titration analysis. An abrupt color change of the indicator usually serves as the signal for reaching the equivalence point. During titration, the concentrations of the sample and standard solution continuously change with the addition of titrant. Near the equivalence point, ion concentrations vary sharply, accompanied by solution color change or precipitate formation. If the standard or sample solution is colored, it can act as an indicator itself, such as potassium permanganate.
Calcon, also known as Calconcarboxylic Acid; Calcon Indicator; Calcium Carboxylate; Calcium Indicator;3‑Hydroxy‑4‑[(2‑hydroxy‑4‑sulfo‑1‑naphthyl)azo]‑2‑naphthalenecarboxylic acid;
1‑(2‑Hydroxy‑4‑sulfo‑1‑naphthylazo)‑2‑hydroxy‑3‑naphthoic acid;2‑Hydroxy‑1‑(2‑hydroxy‑4‑sulfo‑1‑naphthylazo)‑3‑naphthoic acid;Calconcarboxylic Acid Indicator. Calcium Red Indicator (NN) consists of calcium indicator (Calcon / Calconcarboxylic Acid), methanol and other components. It is a commonly‑used metal‑ion indicator (calcium‑ion indicator) for complexometric titration experiments, with an endpoint color change from red to blue.NN shares similar properties with Eriochrome Black‑T. Its color varies with pH values: it appears blue at pH 8‑13, and pink when pH＞13.2 or pH＜7.5.Calcon indicator forms a red complex with Ca²⁺. At pH=13, it can be applied for the determination of calcium in calcium‑magnesium mixtures, and the endpoint changes from red to blue with sharp color transition. Under this condition,Mg²⁺ precipitates as Mg(OH)₂ and will not be titrated. Like Eriochrome Black‑T, calcon indicator is also subject to indicator‑blocking by ions such as Cu²⁺, Ni²⁺, Co²⁺, Al³⁺, Fe³⁺ and Ti⁴⁺. Sodium sulfide, potassium cyanide or triethanolamine can be used as masking agents to eliminate this interference.
Operating Procedure (For Reference Only):
1. Operate in accordance with specific laboratory requirements. Generally, add 1 drop (0.05‑0.1 mL) of indicator to every 10 mL of test solution.
2. Color change at titration endpoint: Red → Blue.
Precautions:
1. Excessive dosage of indicator will shift its color‑change range toward lower pH values. Meanwhile, indicator color‑consumption of titrant will increase measurement error and reduce the sharpness of color transition.
2. Recommended dosages differ for various indicator types. For acid‑base indicators, 1 drop (0.05‑0.1 mL) of indicator is generally added to each 10 mL of test solution.
3. For your safety and health, please wear a lab coat and disposable gloves during operation.
4. Use this reagent as soon as possible after opening to avoid adverse effects on subsequent experimental results.
5. This product is intended for research‑use only. It is not suitable for clinical diagnosis or other applications.
规格
规格或纯度
BioReagent, 指示剂, pH＜7.5 (粉红色); pH 8‑13 (蓝色); pH＞13.2 (粉红色)
稳定性与储存
Store at room temperature long term (12 months).
英文名称
Calcium Red Indicator (NN)
储存条件
室温
运输条件
常规运输
产品线
生物产品
名称和识别符
分子类型
生物试剂/缓冲液
技术文档
高级数据
质检证书（CoA,COO,BSE/TSE 和分析图谱)
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技术文档和文章
溶液计算器
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