Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
N,N-Diethyl-p-phenylenediamine sulfate
1. Basic Information
Name: N,N-Diethyl-p-phenylenediamine sulfate
Alias: 4-Amino-N,N-diethylaniline sulfate, DPD Sulfate
CAS No.: 6283-63-2
Molecular Formula: C10H18N2O4S
Molecular Weight: 262.33
Category: Aromatic amine sulfate, water quality testing reagent, color developing agent
2. Physical and Chemical Properties
Physical Properties
- Appearance: White to light pink crystalline powder
- Odor: Slight amine irritating odor
- Solubility: Easily soluble in water, dilute acid; slightly soluble in methanol; insoluble in ethanol, acetone, benzene and alkanes
- Melting Range: 184–188 °C (decomposes when heated strongly)
- Hygroscopy: Moderately hygroscopic, easy to absorb moisture and discolor in air
- Aqueous Property: Aqueous solution is weakly acidic; easily oxidized and turns purple when exposed to air
Chemical Properties
- Molecular Structure: p-Phenylenediamine derivative; one amino group is diethyl-substituted, the other is free primary amino group, combined with sulfuric acid to form salt
- Oxidation chromogenic reaction: Under the action of chlorine, residual chlorine, ozone, peroxides, it is rapidly oxidized to form stable red-purple quinone imine compounds, the core principle of residual chlorine detection
- Amino reactivity: Primary amino group can undergo diazotization, coupling reaction to synthesize azo dyes
- Air sensitivity: Fine powder absorbs oxygen and moisture in air, gradually turns pink, red, dark purple and loses efficacy
- Thermal Stability: Stable below 160 °C; high temperature decomposition releases toxic amine and sulfur oxide fumes
- Photostability: Extremely sensitive to light; UV irradiation accelerates oxidation discoloration
- Compatibility: Compatible with dilute inorganic acids; incompatible with strong oxidants, strong alkalis, bleaching agents
3. Main Application Fields
1. Water Quality Residual Chlorine Detection Reagent (Core Application)
Standard DPD reagent for drinking water, swimming pool water, industrial circulating water residual chlorine, combined chlorine, ozone content rapid colorimetric detection
2. Photographic Color Developing Agent
Auxiliary developing raw material for color negative film and color printing paper
3. Azo Dye Synthetic Intermediate
Coupling component for synthesizing water-soluble acid dyes and direct dyes
4. Laboratory Analytical Standard
Standard reagent for oxidant content quantitative analysis
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 6283-63-2 |
| Molecular Formula | C10H18N2O4S |
| Appearance | White crystalline powder without obvious purple oxidation impurities |
| HPLC Purity | Analytical Reagent Grade ≥99.0% |
| Water Content (KF) | ≤0.50% |
| Melting Range | 184–188 °C |
| Residue on Ignition | ≤0.10% |
| Single Oxidation Impurity | ≤0.20% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | Nitrogen-filled amber vacuum aluminum foil bags / brown glass reagent bottles |
| Storage Condition | Hermetically sealed, cool dark warehouse below 25 °C; strictly isolated from air, oxidants and light to prevent oxidation failure |
| Transportation Requirement | Light-sensitive, easily oxidized aromatic amine solid, moisture-proof light-proof sealed packaging |
| Shelf Life | 12 months under nitrogen vacuum sealed storage |
Safety Warning
Toxic irritant aromatic amine compound. Dust severely irritates eyes, respiratory tract and skin; skin absorption may cause allergic dermatitis, long-term repeated exposure has potential toxic risk. All operations must be carried out in ventilated fume hood with dust respirator, full-face goggles and nitrile chemical-resistant gloves. Avoid contact with oxidants to prevent violent oxidation and discoloration. Waste liquid neutralized after reduction treatment; solid waste classified as toxic aromatic amine hazardous waste and disposed by professional licensed institutions.
...
Product
