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更新時間：2019-11-20
Dionex OnGuard II 固相萃取小柱設計用來消除基質的干擾，如酚醛塑料，金屬離子，陽離子，陰離子，或在離子色譜應用中存在的疏水性物質。
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The OnGuard II 柱設計用來消除基質的干擾，如酚醛塑料，金屬離子，陽離子，陰離子，或在離子色譜應用中存在的疏水性物質。
Dionex OnGuard II 樣品前處理系列小柱產品包括七種功能類型，兩種大小規格（1.0 cc和2.5 cc）。這些產品適用于對樣品進行分析物的固相萃取和樣品的基體去除。所謂的樣品基體去除是指利用樣品中基體組分與樣品前處理小柱中的固定相之間的*結合使基體中的干擾組分保留在樣品前處理小柱上，而被分析物則不被保留直接通過樣品前處理小柱，從而進行后續的分析測定，這樣就可消除樣品基體中共存組分對測定的干擾。對于分析物的直接固相萃取方法則是指將分析樣品的溶液通過樣品前處理小柱時，分析物由于*的結合作用被直接保留在樣品前處理小柱上，而樣品中的基體組分則不被保留，從而通過樣品前處理小柱，隨后再使用合適的洗脫劑將萃取于樣品前處理小柱上的被分析物洗脫下來進行后續的分析測定，這種方法也可達到分析物富集和樣品基體去除的作用。
由于新的設計理念的采用，Dionex OnGuard II固相萃取小柱系列產品既具有出色的分析性能，有極大的方便了分析者的使用。同時2.5 cc規格的樣品前處理小柱具有較高的柱容量，適合于處理離子強度高的樣品，這種規格的小柱也有利于降低使用成本。另外這種柱型設計也有利于實現樣品前處理過程的自動化。
The OnGuard II Cartridges remove matrix interferences such as phenolics, metals, cations, anions, or hydrophobic substances encountered in many ion chromatography applications. These cartridges have wide pH stability and allow low level ion analysis. Cartridges are available in 1 cc and 2.5 cc high-capacity formats. Six select chemistries are now available in trial size packs of 12 cartridges (listed below).
Facilitate better separations
Increase lifetimes of analytical columns
Solve major matrix problems
Achieve reproducible trace-level determinations in concentrated matrices
The OnGuard II hardware is designed with Luer inlets for easy and secure connections. The cartridge design eliminates leaks and channeling. The unique sample distribution frit maximizes complete resin bed usage. The cartridge hardware is optimized for the best possible performance in matrix removal or concentration applications.
All OnGuard II products are shipped with a Certificate of Analysis verifying product capacity, performance, and cleanliness.
Samples are easy to process. Samples can be passed through the cleanup cartridge directly into the LC injector valve loop using a Luer-style syringe. Alternatively, samples can be processed in parallel using the OnGuard Sample Prep Station.
OnGuard II A
OnGuard II Ag*
OnGuard II Ba*
OnGuard II H*
OnGuard II Na
OnGuard II M
OnGuard II P
OnGuard II RP*
OnGuard II Ag/H*
OnGuard II II Ba/Ag/H*
The OnGuard II family of sample pretreatment cartridges is available in a wide range of packings and in two sizes(1-cc and 2.5-cc) to fit your sample pretreatment needs. In addition, resins are available in the Auto OnGuard? syringe barrel format for robotic processing as custom order products. The Summary tab contains a table summarizing the OnGuard products and their typical applications.
Cartridges can be used singly or in series depending on the matrix interferences to be removed. The OnGuard Ba, OnGuard Ag, and OnGuard H cartridges can be used in series to remove sulfate, chloride, and carbonate from a water sample prior to trace-level determination of bromate.
| ONGUARD II CARTRIDGE CHEMISTRIES AND TYPICAL APPLICATIONS | ||||||
| Cartridge | Functionality | Capacity | Solvents | pH Stability | Mode of Use | |
| (meq/ cartridge) | ||||||
| 1-cc | 2.5-cc | |||||
| OnGuard A | Anion-exchange Bicarbonate form | 0.7 | 1.75 | 0–100% HPLC solvents | 0–14 | Removal of anions; pH adjustment of acidic samples |
| OnGuard Ag | Cation-exchange Silver form | 2.0–2.2 | 5.0–5.5 | 0–100% HPLC solvents | 0–14 | Removal of chloride, bromide iodide by precipitation |
| OnGuard Ba | Cation-exchange Barium form | 2.0–2.2 | 5.0–5.5 | 0–100% HPLC solvents | 0–14 | Removal of sulfate by precipitation |
| OnGuard H | Cation-exchange Hydronium form | 2.0–2.2 | 5.0–5.5 | 0–100% HPLC solvents | 0–14 | Removal of alkaline earth and transition metals; pH adjustment of basic samples |
| OnGuard Na | Cation-exchange sodium form | 2.0–2.2 | 5.0–5.5 | 0–100% HPLC solvents | 0–14 | Removal of alkaline earth and transition metals |
| OnGuard M | Iminodiacetate Ammonium form | 0.4 | 1 | 0–100% HPLC solvents | 0–14* | Concentration of transition metals by chelation (2.5-cc format); removal of transition metals (1-cc format) |
| OnGuard P | Polyvinylpyrrolidone | 6 | Format not available | 0–100% HPLC solvents | 1–10 | Removal of phenols, azo dyes, humic acids by complexation |
| OnGuard RP | Polydivinylbenzene | 0.3 g resin | 0.75 g resin | 0–100% HPLC solvents | 0–14 | Removal of surfactants, high MW carboxylic acids, aromatic dyes by adsorption |
| OnGuard Ag/H | Cation-exchange silver form; cation-exchange hydronium form | Format not available | 4.6 (Ag)0.8 (H) | 0–100% HPLC solvents | 0–14 | Removal of chloride, bromide, iodide by precipitation; removal of alkaline earth and transition metals; pH adjustment of basic samples |
| OnGuard Ba/Ag/H | Cation-exchange silver form; cation-exchange barium form; cation-exchange hydronium form | Format not available | 2.2–2.6 (Ba) 2.2–2.6 (Ag) 0.8 (H) | 0–100% HPLC solvents | 0–14 | Removal of chloride, bromide, iodide by precipitation; removal of alkaline earth and transition metals; pH adjustment of basic samples; Removal of sulfate by precipitation |
* Resin shrinks in acid form.
Dionex OnGuard II 固相萃取小柱
訂貨信息：
| Description | Part Number |
| Dionex OnGuard Cartridges (1-cc) | |
| Dionex OnGuard II A, 1c.c, Pkg of 12 | 088355 |
| Dionex OnGuard II M, 1c.c, Pkg of 12 | 088356 |
| Dionex OnGuard II Na, 1cc, Pkg of 12 | 088357 |
| Dionex OnGuard II P, 1cc, Pkg of 12 | 088358 |
| Dionex OnGuard II RP, 1-cc, pkg of 12 | 082760 |
| Dionex OnGuard II H, 1-cc, pkg of 12 | 082761 |
| Dionex OnGuard II Ag, 1-cc, pkg of 12 | 082762 |
| Dionex OnGuard II Ba, 1-cc, pkg of 12 | 082763 |
| Dionex OnGuard II A, 1-cc, pkg of 48 | 057091 |
| Dionex OnGuard II Ag, 1-cc, pkg of 48 | 057089 |
| Dionex OnGuard II Ba, 1-cc, pkg of 48 | 057093 |
| Dionex OnGuard II H, 1-cc, pkg of 48 | 057085 |
| Dionex OnGuard II Na, 1-cc, pkg of 48 | 062948 |
| Dionex OnGuard II M, 1-cc, pkg of 48 | 057137 |
| Dionex OnGuard II P, 1-cc, pkg of 48 | 057087 |
| Dionex OnGuard II RP, 1-cc, pkg of 48 | 057083 |
| Dionex OnGuard Cartridges (2.5-cc) | |
| Dionex OnGuard II, Ba/Ag/H, 2.5-cc, pkg of 12 | 082764 |
| Dionex OnGuard II Ag/H, 2.55-cc, pkg of 12 | 082756 |
| Dionex OnGuard II A, 2.5-cc, pkg of 48 | 057092 |
| Dionex OnGuard II Ag, 2.5-cc, pkg of 48 | 057090 |
| Dionex OnGuard II Ba, 2.5-cc, pkg of 48 | 057094 |
| Dionex OnGuard II H, 2.5-cc, pkg of 48 | 057086 |
| Dionex OnGuard II Na, 2.5-cc, pkg of 48 | 062962 |
| Dionex OnGuard II M, 2.5-cc, pkg of 48 | 057095 |
| Dionex OnGuard II RP, 2.5-cc, pkg of 48 | 057084 |
| Dionex OnGuard II Ag/H, 2.5-cc, pkg of 48 | 057410 |
| Dionex OnGuard II Ba/Ag/H, 2.55-cc, pkg of 48 | 063955 |
| Dionex OnGuard II Cartridges with Multiple Resin Layers | Inquire |
| All Dionex OnGuard resins are available custom packed with up to | |
| three different resin layers stacked in the 2.5-cc Dionex OnGuard format. | |
| Auto Dionex OnGuard II Barrels | Inquire |
| All Dionex OnGuard resins are available custom packed in 3 mL or | |
| 6 mL syringe-style barrels. These configurations are ideal for robotic processing. | |
| Bulk Dionex OnGuard Resins | Inquire |
| All Dionex OnGuard resins are available as custom orders in bulk in 50 g quantities. | |
| Dionex OnGuard Sample Prep Station | |
| Dionex OnGuard Sample Prep Station | 039599 |
| Dionex OnGuard Needle, 18-gauge, 1.25 Luer | 039996 |
| Dionex OnGuard Sample Reservoir, 5-cc, pkg of 250 | 041233 |
| Dionex OnGuard Valve, Luer stopcock | 040896 |
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