超干级：湿敏化学的水分优先标准
超干级（Ultra-dry grade）试剂指被确认具有极低水含量的产品，通常为个位至几十 ppm（例如：许多溶剂的水分限度为≤20–50 ppm；部分盐类以严格无水的固体形式供应）。由于不存在统一的全球标准，具体限度由生产商针对各个目录货号自行规定，并标注在产品页面/COA（分析证书）上。在阿拉丁网站中，使用“超干级”筛选器即可查看各产品的含水指标（如：甲醇“H₂O ≤20 ppm”；正戊烷“Water ≤50 ...
阿拉丁试剂的规格、级别和纯度
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阿拉丁试剂的规格、级别和纯度
探索阿拉丁生物化学品和试剂的详细规格、分级标准和纯度水平。确保科学研究的可靠性和性能。
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打造更清晰的光学：走进光学玻璃级（Optical Glass Grade）试剂
“光玻级”（Optical glass grade）是供应商定义的质量等级标签，适用于用于光学玻璃熔制或光学薄膜沉积的固体无机原料（通常为高纯氧化物或卤化物）。该等级强调对致色金属杂质（如 Fe、Co、Ni、Cu、Cr 等）的超低限控制，对金属基纯度（例如≥99.99% metals basis）、粒子特性（粒度分布/流动性）与清洁度实施严格把关，以帮助下游玻璃制造商满足光学材料规范（均匀性、气泡/条纹、应力）。需要指出的是，像ISO ...
Designing Clearer Optics: Inside Optical Glass Grade Reagents
“Optical glass grade” ( is a supplier-defined quality label for solid inorganic raw materials (typically high-purity oxides and halides) intended for melting optical glasses or depositing optical thin films. The emphasis is on ultra-low, color-forming metal impurities (Fe, Co, Ni, Cu, Cr…), ...
Understanding Superconductor Grade Reagents
Superconductor grade" refers to reagents such as salts, oxides, organometallic/metal–organic precursors, and powders, which are specifically manufactured and quality-controlled for the preparation of superconducting materials and devices. The emphasis is on:
理解“超导体级”试剂
“超导体级”是指一类专门制造和质量控制的试剂，包括盐类、氧化物、有机金属/金属有机前驱体和粉末，这些试剂主要用于超导材料和器件的制备。其重点在于：
Pesticide Residue Grade (PRA) Reagents: Definition, QC Testing, and Selection Guide
“Pesticide residue grade” (often labeled for pesticide residue analysis, PRA) refers to solvents and auxiliaries produced and QC-tested specifically to minimize background signals and interferences when measuring trace-level pesticide residues—typically by GC-ECD, GC-MS(/MS), or LC-MS(/MS). In ...
农残级（PRA）试剂：定义、QC测试与选型指南
“农残级”（常标注for pesticide residue analysis,PRA）指：为痕量农药残留测定而专门生产，并经质量控制（QC）验证的溶剂与辅助试剂。其目的是在采用GC-ECD、GC-MS(/MS)或LC-MS(/MS)等技术时，最大限度降低背景信号与干扰。该等级意味着：极低非挥发性残渣（NVR）与极低有机污染物背景，并配套针对性的仪器功能测试（例如ECD基线洁净度与农药筛查），从而使分析人员能够在ppb级定量限（LOQ）下工作，而不被溶剂本身引发的假阳性所干扰。各供应商会自行制定并发布相应技术规格，以满足QuEChERS方法（AOAC 2007.01 / EN ...
什么是光谱级（Spectrum Pure）？完整指南
在中国的试剂体系中，“光谱级”/“光谱纯级”（Spectrum Pure，简称SP）是专门用于光谱分析的纯度等级。该标签出现在国家分类标准《GB/T 37885-2019 ...
What is Spectrum Pure Grade? A Complete Guide
In China’s reagent system, “Spectrum pure” (SP) is a purpose-specific purity class used for spectroscopy. The label appears in the national classification standard GB/T 37885-2019 “Chemical reagent—Classification” as one of the recognized categories alongside high-purity, primary standard, ...
危险品化学品经营许可证（带存储）