UV Fluorescence and Chemiluminescence Sulfur-Nitrogen Elemental Analyzer

What is the UV Fluorescence and Chemiluminescence Sulfur-Nitrogen Elemental Analyzer?

A UV fluorescence and chemiluminescence sulfur-nitrogen analyzer burns liquid or gaseous hydrocarbon samples at about 1050 °C and detects SO2 by UV fluorescence and NO by chemiluminescence. It measures total sulfur and nitrogen at 0.1–10,000 mg/kg in fuels and petrochemicals.

Overview

This analyzer injects 5–50 µL of liquid, or introduces gas through a loop, into a quartz furnace at 1000–1100 °C in an oxygen-argon stream. Sulfur is oxidized to SO2 and nitrogen to NO. After drying, SO2 is excited by UV light near 215 nm and the emitted fluorescence at about 350 nm is measured by a photomultiplier, while NO reacts with ozone to form excited NO2 whose chemiluminescence is detected. The two detectors can be combined on one furnace, giving sulfur and nitrogen in a single injection. Linear ranges are typically 0.3–10,000 mg/kg sulfur and 0.3–1000 mg/kg nitrogen. Calibration uses dibutyl sulfide and pyridine-type standards in an appropriate solvent. The design enables compliance with ultra-low sulfur fuel limits of 10 mg/kg and supports ASTM D5453 and D4629.

How does it work?

Elemental analyzers decompose a sample completely, so the element of interest can be measured regardless of its chemical form. Combustion systems burn organic samples in oxygen at about 1000 °C and detect CO2, H2O, N2, and SO2 by thermal conductivity or infrared cells. Inert gas fusion melts metals and ceramics in graphite crucibles, releasing oxygen as CO, and nitrogen and hydrogen as N2 and H2. Induction furnace analyzers combust metals in oxygen and detect CO2 and SO2 by infrared. For liquid fuels, UV fluorescence detects SO2 excited at about 215 nm and chemiluminescence detects nitric oxide reacting with ozone. Combustion ion chromatography absorbs halogen gases into solution and separates the anions on an ion-exchange column. All methods are calibrated against certified standards and require blank control.

What are the key features?

• UV fluorescence detection for sulfur from 0.3 mg/kg to 10,000 mg/kg.
• Chemiluminescence detection for nitrogen from 0.3 mg/kg to 1000 mg/kg.
• Liquid autosampler with 5–50 µL syringe and optional boat inlet for solids.
• Combined S and N module measures both from a single injection.
• Quartz furnace at 1000–1100 °C with ozone generator and dryer.

What are the technical specifications?

A typical uv fluorescence and chemiluminescence sulfur-nitrogen elemental analyzer configuration offers elements measured of Total sulfur and total nitrogen, sulfur range of 0.3–10,000 mg/kg, nitrogen range of 0.3–1000 mg/kg, injection volume of 5–50 µL, furnace temperature of 1000–1100 °C and sulfur repeatability (RSD) of ≤2% at 10 mg/kg. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The UV Fluorescence and Chemiluminescence Sulfur-Nitrogen Elemental Analyzer is used in ultra-low sulfur diesel and gasoline testing, catalyst poisoning assessment in refineries, petrochemical feedstock control and lubricant and additive analysis. Across the wider Elemental Analyzers class, laboratories also deploy it for materials composition verification, petroleum and fuel quality testing and polymer and electronics halogen screening.

Which standards and certifications apply?

Relevant standards and methods include ASTM E1019, ASTM D5373, ASTM D5453, ASTM D4629, ISO 10304-1, ASTM D7359, ISO/IEC 17025 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Elemental analyzers require stable power, clean dry gases of 99.99–99.999% purity, and exhaust extraction for SO2 and combustion gases. Microbalance-based systems need a vibration-free bench and temperature stability within about 2 °C. Calibrate with certified reference materials at installation, after maintenance, and at defined intervals, and run check standards at the start of each batch. Consumables such as combustion tubes, crucibles, and traps have defined lifetimes based on sample count. Samples must be homogeneous, dry, and free of surface contamination. Laboratories under ISO/IEC 17025 or GLP should keep calibration records, balance certificates, and maintenance logs, and validate methods on matrix-matched standards. Electrical safety of laboratory equipment is commonly assessed to IEC 61010-1.

How do I select the right UV Fluorescence and Chemiluminescence Sulfur-Nitrogen Elemental Analyzer?

Choose this platform for sulfur or nitrogen at mg/kg levels in liquid hydrocarbons or gases. It is not a replacement for CHNS analyzers in organic research. In an RFQ, specify sulfur and nitrogen ranges, sample forms, autosampler type, and ASTM D5453 or D4629 support.

How does it compare with other Elemental Analyzers variants?

Choose by the element and matrix rather than by instrument name. Organic powders needing C, H, N, S call for a flash combustion analyzer, and metals needing oxygen, nitrogen, or hydrogen need inert gas fusion. Carbon and sulfur in steel and minerals call for an infrared induction furnace analyzer. Sulfur and nitrogen at mg/kg levels in liquid fuels call for UV fluorescence and chemiluminescence analyzers. Total halogens and sulfur in polymers, electronics, or waste point to combustion ion chromatography. Next specify concentration range, sample mass, required standards, autosampler capacity, and throughput. Ask suppliers for repeatability on reference materials representing your matrix, and confirm consumable requirements such as crucibles, catalysts, reagents, and high-purity gases, since these often dominate operating costs.