UV-Vis Spectrophotometer for Water Analysis with Preset Methods

What is the UV-Vis Spectrophotometer for Water Analysis with Preset Methods?

A double-wavelength or scanning UV-Vis spectrophotometer covering 190 to 1100 nm, loaded with preset water methods for nitrate, UV254, COD and color. It suits laboratories that need both visible colorimetry and direct UV absorbance measurements on one platform.

Overview

This variant extends the visible instrument with a deuterium lamp for the 190–340 nm range and a scanning monochromator with 1–2 nm bandwidth. It enables direct UV determinations such as nitrate at 220 nm with correction at 275 nm, UV254 or SAC254 as an organic load indicator, and aromatic compounds, in addition to all visible colorimetric methods. A spectral scan of each sample helps verify reagent color formation and detect turbidity or interference. A 50-method library includes standard water methods, and users can set up multi-wavelength turbidity correction. The instrument accepts 10 to 50 mm quartz cells for trace UV work, and optional 8-position cell changers and sipper accessories improve throughput. Photometric stability of ± 0.002 A per hour and stray light below 0.05% at 220 nm support low absorbance measurements of drinking water. Deuterium lamps last about 2,000 hours, and quartz cells cost more than glass.

How does it work?

These instruments apply the Beer–Lambert law: absorbance at a chosen wavelength is proportional to the concentration of the absorbing species and the optical path length. For most water tests, a reagent converts the analyte into a colored complex, for example indophenol blue for ammonia, molybdenum blue for orthophosphate, DPD for free chlorine and dichromate reduction for COD. A tungsten-halogen or LED source passes light through a monochromator or interference filter, then through a cuvette or vial to a silicon photodiode or array detector. Readings are compared with a blank and a calibration curve to report mg/L. Water-specific models add pre-programmed methods, barcode-recognized reagent vials, digestion blocks and flow cells to reduce manual steps. UV absorbance at 254 nm is also used directly as a surrogate for dissolved organic matter.

What are the key features?

• Wavelength range 190–1100 nm with 1 to 2 nm bandwidth for UV and visible work
• Direct UV nitrate and UV254 methods with turbidity correction
• Spectral scan mode to verify color development and detect interference
• 50-method water analysis library with user-editable parameters
• Stray light below 0.05% T at 220 nm for low-absorbance drinking water
• Optional 8-position cell changer and sipper for higher throughput

What are the technical specifications?

A typical uv-vis spectrophotometer for water analysis with preset methods configuration offers wavelength range of 190–1100 nm, spectral bandwidth of 1 nm or 2 nm (selectable), wavelength accuracy of ± 0.5 nm, photometric range of −4–4 A, photometric accuracy of ± 0.002 A (0–1 A) and stray light of ≤ 0.05% T at 220 nm and 340 nm. 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-Vis Spectrophotometer for Water Analysis with Preset Methods is used in nitrate and UV254 measurement in drinking water treatment, organic load tracking with SAC254, phenol and surfactant determination and method development and validation in environmental laboratories. Across the wider Spectrophotometers class, laboratories also deploy it for ammonia nitrogen and phosphorus determination, COD testing for wastewater discharge and residual chlorine monitoring in disinfection.

Which standards and certifications apply?

Relevant standards and methods include ISO 7150-1, ISO 6878, ISO 7393-2, HJ 535, HJ 828, HJ 636, USP <857>, JJG 178 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.

Warm the lamp as specified and zero with reagent blanks prepared from the same water. Use matched, scratch-free cuvettes or vials, clean the optical windows and keep reagents within expiry and storage temperature. Verify wavelength accuracy and photometric linearity with holmium oxide and neutral-density or potassium dichromate standards at least annually, and run a mid-range check standard with each batch. Dispose of mercury-, chromium- and sulfuric acid-containing reagent waste, particularly from COD digestion, in accordance with local rules. Place the instrument away from direct sunlight, vibration and drafts. Laboratories operating under ISO/IEC 17025 should record lamp hours, calibration dates and control charts.

How do I select the right UV-Vis Spectrophotometer for Water Analysis with Preset Methods?

Select the UV-Vis variant when direct UV measurements, spectral scans or method development are required, or when low-absorbance accuracy at 220–275 nm matters. A visible-only instrument is cheaper if no UV tests are planned. In an RFQ, state bandwidth needs, stray-light specification, cell types, accessories such as cell changers, and relevant standards such as HJ 84 or ISO 7150.

How does it compare with other Spectrophotometers variants?

Start from the test list and methods you must run. If you report a handful of colorimetric parameters, a visible-range instrument with pre-programmed methods is sufficient. If you need nitrate, UV254 or other UV-absorbing parameters, choose a UV-Vis model. Match throughput to the format: cuvette-based instruments suit flexible method development, while vial-based systems with barcodes cut errors in high-volume testing. For COD, an integrated digestion reactor and photometer reduces handling. Field teams need battery operation and IP-rated housings. Check wavelength accuracy and photometric stability, because trace-level tests near detection limits demand low noise. Also confirm that reagent chemistries follow recognized methods such as ISO, EPA or HJ and that the supplier can provide traceable calibration standards and validation data.