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ALC ALC, 3-[N,N-Bis(carboxymethyl)aminomethyl]-1,2-dihydroxyanthraquinone [CAS: 3952-78-1]
Item #: A006 -

Chemical Structure Product Description ALC is utilized for colorimetric detection of fluoride ion. A red solution of the La(III) or Ce(III) complex turns blue in the presence of fluoride ions. The maximum wavelength of the fluoride complex is 620 nm at pH 4-5. As little as 0.1 to 1 ppm of fluoride ion can be determined using this method. The structure of this complex has been reported as La2L2F2, (La5L4F2)n or Ce5L4F4 (L: ALC). ALC is insoluble in alcohol and ether, slightly soluble in water,...

Arsemate Arsemate, Diethyldithiocarbamic acid, silver salt [CAS: 1470-61-7]
Item #: A012 -

Chemical Structure Product Description Arsemate is soluble in pyridine and chloroform, but insoluble in water and other organic solvents. For arsenic detection, a 0.5% Arsemate/pyridine solution is used. The sample should be treated with sulfuric acid, 15% potassium iodide, and 40% SnCl2/HCl solution to convert arsenic to AsH3. Arsemate reacts with AsH3 in pyridine and forms red colloidal silver with a maximum wavelength at 520-540 nm. The detection range of arsenic using the Arsemate/pyridine...

Azomethine H Azomethine H, 8-Hydroxy-1-(salicylideneamino)-3,6-naphthalenedisulfonic acid, disodium salt [CAS: 32266-60-7]
Item #: A015 -

Chemical Structure Product Description Azomethine H is a colorimetric reagent for boron detection; it forms an orange complex with boron in aqueous solution. The molar absorptivity of this complex is 1.01x104 at 415 nm. The detection range of boron in sample solutions is 1-6 μg per ml. To detect boron in plant samples, EDTA is used to mask copper, iron, and aluminum ions. Azomethine H is used to detect microgram levels of boron in glass and steel samples. ...

Bathocuproinedisulfonic acid, disodium salt Bathocuproinedisulfonic acid, disodium salt, 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthrolinedisulfonic acid, disodium salt, CAS 98645-85-3, CAS 52698-84-7
Item #: B002 -

Product Description Bathocuproinedisulfonic acid is a water-soluble analog of bathocuproine that emits fluorescence under UV light. Since the Bathocuproine-Cu(I) complex formed by this analog is water-soluble, Cu(I) can be determined by direct measurement of the assay solution at 483-522 nm without solvent extraction. The molar absorptivity of the bathocuproinedisulfonic acid-Cu(I) complex is 1.2x104. Dr. Faizullah developed a system to quickly determine Cu(I) at around 30 ppm by using...

Bathophenanthrolinedisulfonic acid, disodium salt Bathophenanthrolinedisulfonic acid, disodium salt, 4,7-Diphenyl-1,10-phenanthrolinedisulfonic acid, disodium salt, CAS 98645-86-4, CAS:52746-49-3
Item #: B004 -

Product Description Bathophenanthrolinedisulfonic acid, disodium salt is a water-soluble derivative of Bathophenanthroline. It is insoluble in organic solvents. Its pKa1 and pKa2 are 2.83 and 5.20, respectively. Due to its high water solubility, Bathophenanthrolinedisulfonic acid can be used to detect Fe(II) in aqueous samples such as blood or biological fluids. The detection range of Fe2+ using Bathophenanthrolinedisulfonic acid is 0.25-4 ppm at 535 nm. The molar absorptivity of the complex...

BT BT, 2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-6-nitro-4-naphthalenesulfonic acid, sodium salt [CAS:1787-61-7]
Item #: B015 -

Product Description BT in aqueous solution changes color according to pH: red at pH<6, blue at pH 7-11, and orange at pH>12. Its proton dissociation constants are reported to be pKa2=6.3 and pKa3=11.55 (m=0.08, 20ºC). BT is one of the most commonly used indicators of Ca, Mg, Zn, Cd, Pb, Hg, and rare earth metals for EDTA chelate titration. BT solution turns red in the presence of the metals at pH 10, and then changes to blue at the endpoint of the titration. Cu and Fe(III), as well as...

Calcein Calcein, Bis[N,N-bis(carboxymethyl)aminomethyl]fluorescein [CAS:1461-15-0]
Item #: C001 -

Product Description Calcein is a fluorescent metal indicator for calcium detection with EDTA titration. It is slightly soluble in water. The proton dissociation constants are reported to be pKa1=2.1, pKa2=2.9, pKa3=4.2, pKa4=5.5, pKa5=10.8 and pKa6=11.7. Calcein solution emits a yellowish-green fluorescence in acidic conditions, and no fluorescence in basic conditions. However, Calcein will emit fluorescence in the presence of metal ions such as Al, Ba, Ca, Cu, Mg, and Zn in basic conditions....

Calcein Blue Calcein Blue, 8-[N,N-Bis(carboxymethyl)aminomethyl]-4-methylunbelliferone [CAS: 54375-47-2]
Item #: C002 -

Product Description Calcein Blue is a fluorescent metal indicator in EDTA titration. It is highly soluble in alkaline solutions, but slightly soluble in water. Its proton dissociation constants are reported to be pKa1=2.45, pKa2=7.24 and pKa3=11.3. Calcein Blue solution emits bright blue fluorescence (λem=445 nm) at pH 4-11, but no fluorescence at pH 12 or higher. The blue fluorescence of the Calcein Blue solution at pH 4-11 is quenched by metal ions such as Co, Cu, Mn, Ni, and Pb. However,...

Cu-PAN Cu-PAN, Mixture of Cu-EDTA and PAN (11.1:1)
Item #: C016 -

Product Description Cu-PAN, a mixture of Cu-EDTA and pyridylazo-naphthol PAN, is a very popular metal indicator for chelatometry. Usually, 20-50% aqueous dioxane (or isopropyl alcohol) or 50-70% aqueous methanol (or ethanol) is used as a solvent (1 g Cu-PAN per 100 ml solvent). The solution should be heated during the chelating titration. ...

Cyanoline Blue Cyanoline Blue, Mixture of monopyrazolone and bisbyrazolone (12.5:1)
Item #: C017 -

Product Description Cyanoline Blue is a mixture of monopyrazolone and bispyrazolone. It is used as a colorimetric reagent for CN- detection. The detection range of CN- by this method is 5 ppb to 10 ppm. The maximum wavelength is 620 nm. A ready-to-use solution can be prepared by dissolving 0.27 g Cyanoline Blue in 20 ml pyridine, followed by dilution with 100 ml of water. The solution is stable for one week at 4 oC. Cyanoline Blue is also used to detect SCN-, OCN-, NH3, and vitamin B12. ...

DAN DAN, 2,3-Diaminonaphthalene [CAS 771-97-1]
Item #: D027 -

Product Description DAN is a highly selective colorimetric and fluorometric reagent for Se detection. This reagent is almost insoluble in cold water and alcohol, but it is higly soluble in water at 50ºC. DAN forms 4,5-benzopiaselenol by the complex with Se, and this complex is extracted with chloroform, toluene, or cyclohexane. Since the Se complex is volatile, Se can be determined by gas chromatography. Further, DAN generates fluorescent naphthalenetriazole by the reaction with nitrite ion,...

Diantipyrylmethane Diantipyrylmethane, Di(4-antipyryl)methane, monohydrate [CAS 1251-85-0]
Item #: D008 -

Product Description Diantipyrylmethane is a colorimetric reagent for Ti detection, and is also used as a gravimetric and solvent extraction reagent for various kinds of metal ions. This reagent is readily soluble in mineral acids and organic solvents, and slightly soluble in benzene (1.7%) and carbon tetrachloride (0.28%). Diantipyrylmethane forms a yellow complex with Ti in 0.5-4.0 M HCl solution (λmax=385-390 nm, ε=15,000). The resulting Ti complex can be extracted by organic solvents in the...

HNB HNB, 2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3,6-naphthalendisulfonic acid, trisodium salt [CAS: 63451-35-4]
Item #: H007 -

Product Description HNB is a metal indicator for calcium, and a colorimetric reagent for alkaline earth metal ions, rare earth metal ions, and uranium ions. HNB is readily soluble in water and alcohol. Aqueous solution of HNB is blue at pH 7-12, red above pH 13, and pink in the presence of calcium at pH 10. The detection range of alkaline earth metal ions and rare earth metal ions are 1-600 ppm and 1-300 ppm, respectively. The maximum wavelength of the complex is 650 nm. HNB is also used for...

Murexide Murexide, Purpuric acid, ammonium salt [CAS 3051-09-0]
Item #: M011 -

Product Description of Murexide and MX MX is a 1:250 mixture of Murexide and potassium sulfate. Murexide is a metal indicator for Ca, Co, Cu, Ni, Th, and rare earth metals; it is also a colorimetric reagent for calcium and rare earth metals. Murexide is slightly soluble in water, alcohol, and ether. Murexide is unstable in aqueous solution. Its proton dissociation constants are reported to be pKa1=0, pKa2=9.2 and pKa3=10.5. The solution is yellow in strong acidic conditions, reddish-purple in...

MX MX, Mixture of ammonium purpurate and potassium sulfate (1:250)
Item #: M012 -

Product Description MX is a mixture of Murexide and potassium sulfate. Murexide is a metal indicator for Ca, Co, Cu, Ni, Th, and rare earth metals; it is also a colorimetric reagent for calcium and rare earth metals. Murexide is slightly soluble in water, alcohol, and ether. Murexide is unstable in aqueous solution. Its proton dissociation constants are reported to bepKa1=0, pKa2=9.2 and pKa3=10.5. The solution is yellow in strong acidic conditions, reddish-purple in weak acidic conditions,...

NN NN, 2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic acid [CAS: 3737-95-9]
Item #: N013 -

Product Description NN is a colorimetric and chelatometric reagent for calcium (pH 12, λmax=470 nm) and UO22+ (λmax=570 nm, ε=1.36x105). Although NN is soluble in water, the solution is unstable and decomposes in a few minutes, especially in the presence of oxidative ions. Its proton dissociation constants are reported to be pKa2=9.26 and pKa3=13.67 (μ=0.1, 24ºC). An NN solution of 0.1% w/v in 50% aqueous methanol is stable for one week if stored in a cool and dark place. Ascorbic acid is used...

o-Phenanthroline o-Phenanthroline, 1,10-Phenanthroline, monohydrate [CAS: 5144-89-8]
Item #: P007 -

Product Description o-Phenanthroline is a colorimetric reagent for iron detection. It is also used as a reagent for the solvent extraction of anions. This reagent is slightly soluble in water (3.3 g/l at room temperature) and benzene (14 g/l at room temperature), and fairly soluble in alcohol (540 g/l), acetone, and diluted mineral acids. Its proton dissociation constants are reported to be pKa1=0.70 and pKa2=4.98 (μ=0.1, 25ºC). o-Phenanthroline forms a red chelate with Fe(II)...

PAN PAN, 1-(2-Pyridylazo)-2-naphthol [CAS: 85-85-8]
Item #: P002 -

Product Description PAN is a metal indicator and colorimetric reagent for heavy metal and rare earth metal ions. This reagent is slightly soluble in acidic solutions and soluble in alkaline solutions. Its proton dissociation constants are reported to be pKa1=2.9 and pKa2=11.6 (μ=0.1, NaClO4, at room temperature). The aqueous solution is yellow at pH<12 and red at pH>12. The distribution constants, logKD, of chloroform/water and carbon tetrachloride/water are reported to be 5.4 and 4.0,...

PAR PAR, 4-(2-Pyridylazo)resorcinol [CAS: 1141-59-9]
Item #: P003 -

Product Description PAR is a metal indicator and colorimetric reagent for heavy metal ions. The solubility of this reagent in water (5 mg per 100 ml at 10ºC) is higher than that of PAN. PAR is slightly soluble in alcohol. The aqueous solution is red at pH 5.5 or less, orange at pH 6-12.5, and red at pH 13 or higher. Its proton dissociation constants are reported to be pKa1(NH+)=3.1, pKa2(p-OH)=5.6 and pKa3(o-OH)=11.9 (m=0.2). PAR forms complexes with various metal ions that can be extracted...

PC PC, 3,3’-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolphthalein [CAS: 2411-89-4]
Item #: P004 -

Product Description PC is a colorimetric reagent and metal indicator for alkaline earth metal ions. This reagent is slightly soluble in water and readily soluble in aqueous ammonia or organic solvents. The aqueous solution is colorless at pH 11, but turns a strong pink in the presence of alkaline earth metals. PC is widely utilized for the determination of serum calcium by an autoanalyzer. Chemical Structure Applications Chelate titration: Ca, Ba, Mg, Sr, CN-, SO42- Colorimetry: Ca, Ba,...

SATP SATP, Salicylideneamino-2-thiophenol [CAS: 3449-05-6]
Item #: S003 -

Product Description SATP is a colorimetric solvent extraction reagent for Cu, In, Ni, and Sn. It is insoluble in water, but soluble in organic solvents. SATP forms yellow or brown complexes with various metal ions. The Sn(II) complex can be extracted with benzene (maximum wavelength: 415 nm, molar absorptivity: 1.61x105), xylene and toluene. Chemical Structure ...

Sodium bicinchoninate Sodium bicinchoninate, 4,4’-Dicarboxy-2,2’-biquinoline, disodium salt [CAS: 979-88-4]
Item #: B037 -

Product Description Sodium bicinchoninate is a Cu(I)- specific colorimetric reagent that is more sensitive than neocuproine. Its absorption maximum is at 562 nm (molar absorptivity: 7,900). In alkaline solution, Cu(II) is reduced by proteins to Cu(I), and then forms a purple complex with Sodium bicinchoninate. The protein detection range of this assay is 1-2,000 mg per ml. Chemical Structure ...

Tiron Tiron, 1,2-Dihydroxy-3,5-benzenedisulfonic acid, disodium salt, monohydrate [CAS: 149-45-1]
Item #: T021 -

Product Description Tiron is used as a metal indictor of Fe, and as a colorimetric reagent of Fe, Al, Ti, and other metal ions. Tiron is readily soluble in water as a colorless solution. The pKa2 is reported to be 12.6 (μ=0.1, 20ºC). Tiron forms colored chelates with Fe, Ti, and other metal ions. The color of the Fe complex is blue at pH 1-4 (1:1, logK=20.4), purple at pH 5-7 (1:2, logK=15.1), and red at pH 7 or over (1:3, logK=10.8). Product Description Application Chelate titration: Fe...

TOPO TOPO, Tri-n-octylphosphine oxide [CAS: 78-50-2]
Item #: T024 -

Product Description TOPO dissolves in cyclohexane. TOPO forms adducts with metal chelates to enhance solvent extraction efficiency (Synergistic effect). It can be used for rare earth metals, actinoids, and other metal ions indicated below. Product Description Application Solvent extraction: Al, Au, Co, Cr, Fe, Hf, Re, Ti, UO22+, V, Zr, rare earth metals, actinoids ...

TPPS TPPS, 5,10,15,20-Tetraphenyl-21H, 23H-porphinetetrasulfonic acid, disulfuric acid, tetrahydrate [CAS: 35218-75-8]
Item #: T003 -

Product Description TPPS is a water-soluble porphyrin that is reddish-purple in aqueous solution at pH 6.5 (maximum wavelength: 413 nm, molar absorptivity: 5.1x105) and green at pH 4 (maximum wavelength: 434 nm, molar absorptivity: 5.0x105). Its proton dissociation constants are reported to be pKa1=4.86 and pKa2=4.96. TPPS selectively forms a complex with Cu2+ in acidic conditions, and with Cd, Cu, Fe, Pb, and Pd in alkaline conditions. ...

XO XO, 3,3-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein, disodium salt [CAS: 1611-35-4]
Item #: X003 -

Product Description XO is a colorimetric reagent and metal indicator of various metal ions. It is readily soluble in water. Its proton dissociation constants are reported to be -1.74, -1.09, 0.76, 1.15, 2.58, 3.23, 6.40, 10.5, and 12.6 (ion strength: 0.2). The color of the aqueous XO solution is yellow at pH < 6.3 and pink at pH > 6.5, and turns reddish-violet in the presence of metal ions. XO forms complexes with various metal ions in acidic conditions. Therefore, XO can be used to...

Zincon Zincon, 1-(2-Hydroxycarbonyl-phenyl)-5-(2-Hydroxy-5-sulfophenyl)-3-phenylformazan, sodium salt [CAS: 62625-22-3]
Item #: Z002 -

Product Description Zincon is a colorimetric reagent for Zn and Cu detection, and a metal indicator in EDTA titration. This reagent is insoluble in organic solvents, but slightly soluble in water and alcohol. Its proton dissociation constants are reported to be pKa1=7.9-8.3, pKa2=7.9-8.3 and pKa3=13-14. The aqueous solution of Zincon is yellow or orange-yellow in weak alkaline conditions, and turns blue in the presence of Cu (maximum wavelength: 600 nm, molar absorptivity: 1.9x104) and Zn (pH...