Measurement and Results

Is CGOS1 really tracable to NIST? What is the NIST catalog number?If not traceable to NIST, what is the reference material and batch number?

I would like to know the starting material for your turbidity standard, QCP-TURB. Is it formazin based? We need a turbidity standard based upon formazin of about 500-1000 NTU. We work with Standard Methods 2130B using equipment calibrated with formazin compound as primary standard.

Is it possible to use salt CRMs, like phosphate and nitrite for ICP applications, or are the for ion chromatography (IC) uses only? In other words, can they all be used with ICP or only the CRMs certified for single atoms such as those denoted “as N” or “as P”?

How do we test a solution for Cr+6 ? Can I use ICP and do you have a Cr+6 standard I could use?

I was looking online for method for measuring chloride in milk using ICP-MS, and wondered if you had any suggestions?

Our laboratory is in need of custom made Total Silica (dissolved + colloidal silica) standard that is to be used in a colorimetric method to analyze dissolved and colloidal silica in ultrapure and reclaim water. Can you provide such a a standard?

I've heard about your Transpiration Controlled Technology (TCT), and would like to know more. My background is in inorganic analysis and involves developing reference methods for trace analysis. As such, our organization gives a lot of attention to measurement uncertainty and transpiration.

I am interested in the following products: QCP-DMD, QCP-CAT, and QCP-MIN. All of these standards are for waste water and for potable water., and I would like to know why are not specific for each kind of water. Could I use these standards for measuring TOC in either potable or waste water analyses or do you have specific standards?

I would like to inquire about the expected relative precision associated with a custom calcium and phosphorus ICP-MS standard. Could you let me know what precisions for the Ca and P concentrations I can expect? For the single element Ca and P standards we have from you it is about +-0.5% (at 100 ug/mL). Is it possible to obtain a custom standard with an even higher precision (e.g. +-0.1%).

We have performed a linearity study from low to high concentrations for different metals. The slopes were recorded for 0:10, 0:20, 0:50, 0:100, and 0:150 ppb. We were wondering if you knew of literature recommending the maximum allowed % difference between the slopes before data calculations became compromised or biased.