Laboratory Chemicals | Loc Thien Chemicals. Same-Day...

EHS Lab Test Chemicals — Titration, Wastewater Analysis | Loc Thien

Loc Thien supplies specialized laboratory chemicals for EHS and QC labs in industrial parks in Ho Chi Minh City, Binh Duong, and Dong Nai. Products come with complete CoA (Certificate of Analysis), MSDS, and CO/CQ. Same-day delivery available in VSIP, Nhon Trach, and Amata industrial parks.

What are laboratory chemicals?

Laboratory chemicals (reagents) are high-purity chemical compounds used in quantitative analysis (titration), qualitative analysis, and wastewater quality testing in accordance with QCVN 40:2011/BTNMT and QCVN 01:2009/BYT. Unlike industrial chemicals (used in large quantities with lower purity), laboratory chemicals must meet analytical grade or reagent grade standards, typically achieving a purity of ≥99.1% and accompanied by a Certificate of Analysis (CoA) specifying impurity levels.

Titration Drugs — Lab Standards

Titration reagents are standard solutions with precisely determined concentrations, used for quantitative analysis in the factory's EHS lab.

NaOH 0.1N (Sodium Hydroxide) — CAS 1310-73-2 | Acid titration: determine acidity in wastewater, pH testing, analysis of total alkalinity parameter according to QCVN 40:2011
H₂SO₄ 0.1N (Sulfuric Acid) — CAS 7664-93-9 | Base titration: determination of alkalinity, NH₄⁺ in plant wastewater, checking N-NH₄ indicator according to TCVN 5988
KMnO₄ 0.1N (Potassium Permanganate) — CAS 7722-64-7 | Determination of Oxidized Matter (Permanganate Index), Indirect COD in Wastewater according to SMEWW 4500-KMnO₄
EDTA 0.1M (Ethylenediaminetetraacetic acid) — CAS 60-00-4 | Complexometric titration: determination of total hardness (Ca²⁺ + Mg²⁺), heavy metals Zn, Cu, Pb in wastewater
0.1N Sodium Thiosulfate — CAS 7772-98-7 | Iodometric titration: Determination of DO (dissolved oxygen), residual Cl₂ in treated wastewater

pH Indicators & Buffers

Color indicators and pH buffer solutions are essential for accurate titrations and instrument calibration in the lab:

Phenolphthalein 1% Acid-base indicator, pH color change 8.2–10.0 (colorless → pink). Used for NaOH titration, determination of phenolphthalein alkalinity (P-alkalinity) in wastewater.
Methyl Orange 0.1% — Acid-base indicator, pH color change 3.1–4.4 (red → yellow). Used for titrating strong acids, determining total alkalinity M-alkalinity
Bromothymol Blue 0.1% pH color change 6.0–7.6 (yellow → blue). For neutral pH analysis, biological treatment testing
Murexit (Ammonium Purpurate) Instructions for titrating Ca²⁺ with EDTA at pH 12, distinguishing Ca²⁺/Mg²⁺
Buffer pH 4.01 (Potassium Hydrogen Phthalate) — Calibrate pH meter at acidic point, NIST traceable certification
Buffer pH 6.86 / 7.00 — Neutral point calibration, daily use according to ISO/IEC 17025
Buffer pH 9.18 / 10.01 — Calibrate alkaline point, pre-test measurement of high-alkaline wastewater

Application: Wastewater Testing According to QCVN 40:2011

QCVN 40:2011/BTNMT stipulates industrial discharge limits. The EHS lab at the Industrial Park factory needs to regularly check the following parameters using corresponding laboratory chemicals:

pH (6–9 Column A; 5.5–9 Column B) — Calibration with pH buffer 4/7/10; measurement with pH meter
COD <75 mg/L (A) / <150 mg/L (B) — K₂Cr₂O₇ (dichromate) method: K₂Cr₂O₇, concentrated H₂SO₄, FeSO₄(NH₄)₂SO₄; or KMnO₄ method for lightly polluted samples
BOD₅ <30 mg/L (A) / <50 mg/L (B) Phosphate buffer, MgSO₄, CaCl₂, FeCl₃; incubate 5 days 20°C; measure DO by Na₂S₂O₃
SS <50 mg/L (A) / <100 mg/L (B) — Filter through GF/C filter paper, dry at 105°C — no special chemicals required
Ammonia-nitrogen <5 mg/L (A) / <10 mg/L (B) — Nessler method: Nessler reagent, KNaC₄H₄O₆ (Rochelle salt), ZnSO₄; or titrate with 0.1N H₂SO₄ after distillation
Total Nitrogen <20 mg/L (A) / <40 mg/L (B) — Sample degradation using K₂S₂O₈ + NaOH, measured by UV-Vis
Total P <4 mg/L (A) / <6 mg/L (B) — Ammonium molybdate + ascorbic acid + antimony potassium tartrate; UV-Vis measurement at 880nm

Standards & Documentation

Each batch of laboratory chemical supplies from Loc Thien is provided with complete legal and technical documentation:

CoA (Certificate of Analysis) — Analyze impurity levels and verify a purity of ≥99% for each production batch
MSDS/SDS (Safety Data Sheet) — Chemical Safety Data Sheet (GHS/OSHA compliant), for occupational safety training and customs declaration
Certificate of Origin — Certificate of Origin, meeting import and factory audit requirements
Certificate of Quality Quality certificate from the manufacturer, equivalent to ISO 9001 QC record
Comply with QCVN 40:2011/BTNMT Wastewater analysis chemicals meet BTNMT testing standards
ISO/IEC 17025:2017 — Traceable pH buffer and titrant solutions to national NIST/PTB standards

Same-day delivery to industrial parks

Loc Thien specializes in supplying laboratory chemicals delivered directly to factory warehouses in major industrial parks.

KCN VSIP I, VSIP II (Binh Duong) — Same-day delivery, packaged to meet IMDG dangerous goods transport standards
Nhơn Trạch Industrial Park (Dong Nai) — Deliver before 5:00 PM if ordered before 10:00 AM
KCN Amata, Long Binh (Dong Nai) — Chemicals packed in 500mL, 1L, 2.5L, 5L as required.
Tân Bình and Tân Phú Districts (Ho Chi Minh City) — Issue VAT invoice immediately upon delivery
Hiep Phuoc Industrial Park, Cat Lai (Ho Chi Minh City) — Free consulting support for selecting chemicals that comply with QCVN