NB/SH/T 0880-2014 Determination of calcium, chlorine, copper, magnesium, phosphorus, sulfur and zinc in lubricating oils and additives — Wavelength dispersive X-ray fluorescence spectrometry

Summary page. This page is a compiled excerpt/summary of the standard — it is not the full standard text and does not replace it. Verify every value against the official standard and the product certificate before use.

NB/SH/T 0880-2014 specifies the determination of calcium, chlorine, copper, magnesium, phosphorus, sulfur and zinc in unused lubricating oils, additives and packages by wavelength dispersive X-ray fluorescence spectrometry, and this page summarizes its evidence boundary, scope, principle, apparatus, calibration, equations, limits, quality control and precision.

Evidence note: an original learning card compiled from the 15-page 2014 original in hand, not the full standard text or a controlled operating procedure. Technical review is pending; the complete calibration matrix, instrument spectral line settings and additive precision table have not been reconstructed, and no unverified calculator is provided. Method precision is not batch uncertainty, and product applicability or standard equivalence is not presumed.

Version studied and evidence boundary: Original PDF pages 1–2; official version and the 2014 No. 8 filing announcement. The version studied is NB/SH/T 0880-2014, published 2014-06-29 and implemented 2014-11-01, filing 46576-2014. The original foreword states modification adoption of ASTM D6443-04(2010); modification adoption is not called equivalence. The current official entry shows the standard as current, and the filing announcement confirms the same number, year and dates; the two services belong to the same official system and cannot be treated as two independent technical acceptances. The original and the OCR are read-only; OCR is used for locating, and page-count checking is not technical review approval.

Determinands and applicability limits: Original PDF page 3, Chapter 1 and Table 1. The method determines calcium, chlorine, copper, magnesium, phosphorus, sulfur and zinc in unused lubricating oils, additives and additive packages; these seven elements must not be expanded into all elements or into used oils. Samples above the upper limit of the Table 1 calibration range must be diluted and re-analysed, and curve extrapolation must not be carried over automatically. The method does not apply where significant interferences are untreated. Original Table 1 is a calibration sample concentration matrix, not a universal range for every instrument or every product; the complete ten-set formulation matrix is not reconstructed on this page, and practical use requires checking the original table and the actual calibration records.

Principle, intensity and matrix correction: Original PDF pages 3–4, Chapters 3–5. Wavelength dispersive X-ray fluorescence spectrometry measures the element spectral line and background, uses regression of concentration against net intensity for calibration standards, and corrects absorption, enhancement and spectral overlap with theoretical or empirical α coefficients. Net intensity is not an element content without calibration. Molybdenum spectral lines may overlap those of magnesium, phosphorus, sulfur and chlorine; high molybdenum and high lead cannot be handled by this method without correction. Silicon-containing crystals excited by the sample's calcium X-rays can affect the magnesium background and, when significant, are treated as spectral overlap. Unconfirmed automatic correction must not be taken as interference already eliminated.

Apparatus and sample support: Original PDF page 4, Chapter 6. Soft X-ray analysis covers wavelengths of 1 Å to 10 Å; the X-ray tube, interchangeable analysing crystals, pulse height analyser and detector must be matched to one another and the tube spectral lines kept away from the elements to be determined. Original 6.1.2 and 7.2 specify helium scanning, with high-purity helium of at least 99.95% in 7.2; OCR misreadings must not be turned into nitrogen or ammonia. The mixing device handles 30 mL to 1000 mL bottles; the support film of the liquid cup may be polyester, polypropylene or polyimide, preferably 4 µm thick, and the film must not contain the elements to be determined. The specific crystal/tube and the Table 3 instrument settings are not fully reconstructed, and an instrument is not considered conforming on the basis of its name.

Gases, diluents and calibration materials: Original PDF pages 4–5, Chapter 7. The P10 ionizing gas is a mixture of 90% by volume argon and 10% by volume methane, and the original precision tests used this gas; the original permits other satisfactory mixtures, but a substitute gas is not chosen on one's own initiative. The dilution solvent is a white oil free of the elements to be determined. Oil-soluble organic standards may contain calcium, copper, magnesium, phosphorus or zinc respectively; if a sulfonate contains sulfur, its known sulfur content must be counted in preparing the standard. The sulfur content of dibutyl sulfide must be known, and it is flammable and toxic; oil-soluble chlorine standards likewise require a known content, and the stabilizer must not introduce the elements to be determined. No specific product is promised here to have a certificate or to be applicable.

Calibration sets and drift monitoring: Original PDF pages 5–7, Chapter 9. Empirical α uses all ten sample sets of Table 1; theoretical α uses sets 2, 6, 8 and 10 of Table 1. The concentration matrix, calibration and drift monitoring have different roles, and glass or metal monitors do not replace concentration calibration standards. The relative count deviation of the high-content monitor for each element is less than 0.25%. Original 10.5.1.1 states that the magnesium calibration curve needs no α correction; 10.5.1.2 allows the copper α to be neglected for each element because the highest detectable copper content is only 0.05% and the empirical copper α may be unreliable. Theoretical, empirical and mixed corrections are confirmed separately, and the complete software implementation is not verified.

Original concentration equation and symbols: Original PDF pages 6–7, equation 1. Original equation (1): C_i=(D_i+E_i I_i)(1+Σ_j α_ij C_j). C_i and C_j are mass fraction percentages; D_i is the calibration intercept, E_i the slope, I_i the net intensity, and α_ij the inter-element correction coefficient. The multi-element concentrations and correction terms are coupled, and the solution and confirmation records of the actual software have not been reconstructed. The original equation must not be treated directly as a verified calculator of this website, nor the α coefficients as the uncertainty of any batch certificate.

Sample mixing, cups and measurement order: Original PDF page 7, Chapters 10–11. Mix and then fill the cup; the liquid must occupy at least 3/4 of the cup volume, the film must be flat, leakage/wrinkling avoided and venting handled as the original requires. Use a new cup and film for re-measurement. One analysis normally takes about 4–5 min, which is only the statement of the original and not a uniform guaranteed time. Magnesium and chlorine are most sensitive to changes in the shape of the sample cup, and original 10.4.1 recommends measuring these two elements first. The report must retain the sample identity, the calibration/matrix correction path, the net intensity, dilution, cup film and QC records; accuracy is not judged from the instrument reading alone.

Detection and quantification limits of the original table: Original PDF page 6, Table 2; page 11, 14.4. Original Table 2 has only six element columns and does not give sulfur; the example mass fraction percentages below are not fixed limits for any laboratory, still less product certificate specifications. Original 14.4 gives a detection limit of 3s_r and a quantification limit of 10s_r, where s_r is the pooled repeatability standard deviation of samples whose content is less than five times the estimated detection limit. The sulfur samples were too high, so their LOD/LOQ were not evaluated. Element | Detection limit of the original table/% | Quantification limit of the original table/% Ca | 0.0002 | 0.0008 Cl | 0.0004 | 0.0015 Cu | 0.0002 | 0.0007 Mg | 0.0039 | 0.0130 P | 0.0006 | 0.0020 Zn | 0.0002 | 0.0007

Quality control, reporting and rounding: Original PDF page 7, Chapters 12–13; Annex B. Chapter 12 requires periodic measurement of one or more QC samples with a similar matrix and comparison with the laboratory control range; when out of control, check drift, recalibrate or re-measure, and a single successful calibration must not be called long-term control. The frequency in informative Annex B is set by stability, importance and customer requirements. Results greater than 0.0100% are reported to three significant figures, 0.0010% to 0.0100% to two, and less than 0.0010% to one; 0.0100% does not fall in the greater-than range. Diluted samples are multiplied by the dilution factor. Below the detection limit report not detected or less than the LOD value; a suitable LOD after dilution must be multiplied by the dilution coefficient, and zero must not be written on one's own initiative.

Applicability range of the oil precision: Original PDF page 8, 14.1 and Table 4. The original precision at the 95% confidence level compares two determination results, X being the mean mass fraction percentage of the two results. The range is the interval validated in that study and is not the full calibration matrix range, batch uncertainty or the additive range. r applies to consecutive determinations in the same laboratory/by the same operator/on the same instrument; R to single independent results from different laboratories/operators/instruments. Element | Content/% | Repeatability r/% | Reproducibility R/% Ca | 0.001–0.200 | 0.006914(X+0.0007)^0.5 | 0.04762(X+0.0007)^0.5 Cl | 0.001–0.030 | 0.0356(X+0.0086) | 0.05612(X+0.0340) Cu | 0.001–0.030 | 0.002267(X+0.0013)^0.4 | 0.01068(X+0.0013)^0.4 Mg | 0.003–0.200 | 0.01611(X+0.0008)^0.333 | 0.05208(X+0.0008)^0.333 P | 0.001–0.200 | 0.02114X^0.7 | 0.09112X^0.7 S | 0.030–0.800 | 0.02371X^0.9 | 0.1623X^0.9 Zn | 0.001–0.200 | 0.01225X^0.7 | 0.06736X^0.7

Typical values and additive boundaries: Original PDF pages 8–10, Tables 5–9. Example from original Table 5: for magnesium at a content of 0.0030% r = 0.0025%, and at 0.0100% r = 0.0036%, both in mass fraction percentage. The typical oil values of Tables 5/6 are not fully transcribed cell by cell; Tables 7/8/9 separately list additive precision, a watermark crosses part of the dense numbers, and this page neither fully reconstructs nor guesses them. The oil formulas above must not be used in place of additive acceptance limits. Item-by-item verification against the original and technical approval are still required, and no automatic judgement program is published.

Bias and informative annexes: Original PDF pages 10–13, 14.3 and Annexes A/B. The original bias discussion used two oils, G/J; sulfur was excluded because the sulfur content of the formulation was uncertain and chlorine because contamination was suspected, while the other five elements showed no significant bias; this study does not prove that all samples, all seven elements or all instruments are absolutely unbiased. Annexes A/B are both informative, covering test assistance and QC monitoring respectively. QC samples should be representative, homogeneous and stable, with control records; precision, detection limit and certificate uncertainty must not be merged into a single number.

References, open items and independent acceptance: Original PDF pages 3–15; source records for this round. The original cites GB/T 17476, SH/T 0631, NB/SH/T 0824, ASTM D4628 and others as method supplements, and lists other original references; this page does not reconstruct the complete reference list and does not automatically change years or infer equivalence. The applicability of actual samples, calibration materials and product certificates is checked separately. The complete ten-set calibration formulations, instrument spectral line parameters, all cell values of Tables 5–9, and the on-instrument software solution/controlled safety operations have not been reconstructed; technical review and independent Hermes/Grok acceptance remain to be completed. The old public product association block is retained, no relationship is added, and the scanned original is not published.

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