Calmagite is a complexometric indicator used in analytical chemistry to identify the presence of metal ions in solution. As with other metal ion indicators calmagite will change color when it is bound to an ion. Calmagite will be wine red when it is bound to a metal ion and may be blue, red, or orange when it is not bound to a metal ion. Calmagite is often used in conjunction with EDTA, a stronger metal binding agent. This chemical is also used in the quantitation of magnesium in the clinical laboratory.

CAS：3147-14-6
中文别名：1-(1-羟基-4-甲基-2-苯基偶氮)-2-萘酚-4-磺酸;1-(1-羟基-4-甲基-2-苯偶氮)-2-萘酚-4-磺酸;
英文别名：3-hydroxy-4-[(2-hydroxy-5-methyl-1-phenyl)azo]-1-naphthalenesulfonic acid;3-hydroxy-4-(6-hydroxy-m-tolylazo)naphthalene-1-sulfonic acid;CalmagiteIndicatorGr;1-(1-Hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic Acid;CalMagite [Metal indicator ,Mg etc.];1-(1-Hydroxy-4-methyl-2-phenylazo)-naphthol-(2)-sulfonsaeure-(4);Caimagite;CALMAGITE INDICATOR;Calmagite solution;1-(1-hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic acid;3-hydroxy-4-(2-hydroxy-5-methylphenylazo)naphthalene-1-sulfonic acid;CALMAGIT Z. ANALYSE;
分子式：C17H14N2O5S
分子量：358.368
精确质量：358.062
Psa：127.93
Logp：5.3023

MDL号：MFCD00011656

外观与性状：暗棕色结晶粉末
密度：1.48 g/cm3
熔点：300ºC
折射率：1.682
稳定性：Stable. Incompatible with strong oxidizing agents.
储存条件：Store at RT.

安全说明：S24/25
危险类别码：R36/37/38
海关编码：2927000090
危险品标志：Xi

生产方法
由1-氨基-2-萘酚-4-磺酸与对甲酚制取。 用作在pH值10的条件下用EDTA滴定Ca2+、Mg2+的指示剂,终点由红变蓝。
用途
用作在pH值10的条件下用EDTA滴定Ca2+、Mg2+的指示剂,终点由红变蓝。